p140说：模板支架纵横扫地杆是：纵下横上,但是p174脚手架扫地杆又说：是横下扫地杆在纵向扫地杆下方?

问题 太大了 无法回答
先跑个叫 看DNA有没有降解,再看看引物有没有降解
换个酶试试

这个很正常,引物本身的结构和模板的结合牢固程度,就会影响扩增的效率,导致扩增出来的片段亮度不同.

a

解题思路：（1）根据题意，进行剪拼即可画出它们的拼接图形，
（2）先根据正方形ABCD的面积，求出正方形的边长，再根据△HED的面积是正方形ABCD的面积的[1/16]，即可求出答案．

（1）它们的拼接图形是：

（2）因为正方形ABCD的面积为16，
所以正方形的边长是4，
所以△HED的面积是1．

点评：
本题考点： 图形的剪拼．

考点点评： 此题考查了图形的剪拼，解题的关键是根据正方形的性质求出△HED的面积与正方形ABCD的面积之间的关系．

DNA的每一条链上都有遗传信息
都会合成相应的mRNA,再合成蛋白质
但是按照你说的,说明DNA模板链具有遗传信息

一般模板是成熟mrna,合成的是RNA/DNA杂化链.

Geetings and introduction:
Good afteroon, my name is zhengyaqian, Now I’ll say , My topic is made of five parts. It includes Teaching material analysis, Teaching methods ,Study methods ,Teaching procedures and blackboard design.
一． Teaching material analysis.
I. Status and function
Today I’m going to talk about_______________________________________
This is an important lesson. From this lesson, it starts asking the Ss to grasp contents of each Sample. To attain “four skills” request of listening, speaking, reading and writing. To start listing “Word Bank” and tell the Ss to remember the new words. To start asking the Ss to write the English sentences well. Therefore this lesson is in the important position of the teaching material.
Such a topic is related to daily life, so it is helpful to raise learning interests of students and it will be also helpful to improve their spoken English.
II. Teaching aims
1. Aims on the knowledge
(1) To enable the Ss to understand and speak: ______________________ Make sure that Ss can use these sentences in real situations.
(2) To help Ss to finish _________________________________
2. Aims on the abilities
(1) To develop Ss’ abilities of listening and speaking.
(2) To train the Ss’ ability of working in groups.
(3) To foster Ss’ abilities of communication .
3. Aims on the emotion
(1) To foster Ss’ consciousness of good co-operation and proper competition.
(2) To enable Ss to_________________________________
4. Key-points of this lesson
(1) To help Ss_____________________________________
(2) To enable Ss to study in groups and co-operate skillfully.
(3) To develop Ss’ interest in English.
5. Difficult points
(1) To help the Ss ________and make sure they can use ____________correctly.
(2 )How to_________________________________________
6. Teaching aids
In this lesson, the multi-media will be used to make the class lively and
improve my teaching result.
二 .Teaching methods
As we all know: the main instructional aims of learning English is to cultivate pupils’ basic abilities of listening and speaking and their good sense of the English language. So in this lesson I’ll mainly use “Task-based” teaching method. That is to say, I will let the Ss learn in real situations, finish a task by making a survey to help the Ss to get a better understanding of the key structure of the dialogue. I will arrange four kinds of activities: singing, guessing game, finishing a survey and having a competition. And in this lesson a recorder, CAI, school things and a printed form will be needed. Students should prepare some school things.
三．Study methods
① Teach the Ss how to be successful language learners.
②Get the Ss to form good learning habits.
③Teach the Ss how to communicate with others and take competition methods to develop the Ss interest in English.
四．Teaching procedures and purposes of my designing.
I’ll finish this lesson in five steps.
Step 1. Warm-up and preview
_______________________________________________________________________________
Purpose: It is important to form a better English learning surrounding for the Ss by singing and doing some total physical response and at the same time
it provides situations to review learned knowledge for the next step.
Step 2. Presentation
Now I’ll mainly talk about this step.
_____________________________________________________________________________
Purpose: To present the key structures one by one is much easier for the Ss to learn
and grasp the meanings. Proper competition can arouse the Ss’ interest in English learning.
___________________________________________________________________________
Purpose: CAI can provide a real situation for the Ss to understand the dialogue
and the relationships between people better. Tell the Ss we should show
our loveliness to the Ss.
Step 3. Practice
_______________________________________________________________________________
Purpose: Task-based teaching method is used here to develop Ss’ ability of
communication and also their ability of co-operation will be well trained.
Step 4. Production
_______________________________________________________________________________
Purpose: To check the knowledge Ss have learned in this period.
Step 5. Homework
__________________________________________________________________________
Purpose: Revision is so important that Ss should speak English as much as they
as in class or after class. It is necessary for the Ss to do some extensive exercises
after class to consolidate the knowledge they learned.
五．Blackboard design

fail 无论怎样,如果ED（艾德）不见了就失败了.

只有需要进行细胞分裂时DNA才会复制,而转录是为了合成蛋白质,随时都在进行,所以转录的模板是亲代DNA单链.当DNA复制时母链发生基因突变,后合成的子链在通过碱基互补配对添加碱基时就会以突变了的母链为模板,自然结果也是突变链

选D
A逆转录
B翻译
C复制

我准备了雅思很久啦!~ 我们可以交流 O(∩_∩)O哈!
托福作文分我还行拿了25
Depending on personal experience, personality type and emotional concern, we find that some people hold the idea of A meanwhile others prefer to B, from my point of view, it is more advisable to chose A rather than B. My arguments for this point are listed as follows.
The main reason for my propensity for A is that___________________________.就理由进行解释_____________________.For instance,____________________ Another reason can be seen by every one is that____________________________.就理由进行解释___________________For example,____________________
The argument I support in the first paragraph is also in a position of advantage because_____________________________
Although I agree that there may be a couple of advantages of B, I feel that the disadvantages are more obvious. Such as________________. 寄托
In a word, ________________________________________________.So, it is sagacious to support the statement that it is better to A.
作文文套二
A or B
将原题复述___________________________________________When faced with the decision of A of B, quite a few would deem that______________________, but others, in contrast, believe A/B as the premier choice and that is also my point. Among countless factors which influence -A/-B, there are three conspicuous aspects as follows.
The main reason for my propensity fo _________is that___________________
The second reason can be seen by every person that________.
In addition, these reason are also usable when we consider that_________.
There are some disadvantages in____________________另一种观点的缺点__________.
In a word, _____________重复观点句并缩写理由__________________.Taking into account of all these factors, we may reach the conclusion that___________.
作文文套三
单一命题式
The answer of this statement depends on your own experience and life style. In my point view, buying computers is as important as, if not more important than, buying books. So it is sagacious to ____________.Among countless factors which influence the choice, these are three conspicuous aspects as follows.
The main reason for my propensity for__________is that____________. !J;} I2x9IC:^
Another reason can be seen by every person is that________________. c
作文文套四
agree or disagree
Some people argue as if it is a general truth that a _____________________________.But to be frank, I cannot agree with them. There are numerous reasons why I hold no confidence on them, and I would explore only a few primary ones here.
The main problem with this argument is that it is ignorant o the basic fact that______________解释本段中心___________.
Another reason why I disagree with the above statement is that I believe that______________. j¬J @ c7W
What is more, some students are interested in____________.
In a word, ________________.
作文文套五
Some people prefer to A. others believe B. When faced with the decision of A or B, quite a few would claim that______________, but others, in contrast , deem A/B as the premier choice and that is also my point. There are numerous reasons why___________, and I would explore only a few of the most important ones here.
The main reason why I agree with the above statement, however, is that_____________________. Take___________as example, ______________.
There is another factor that deserves some words here. Such as ________________________.
Similarly, these reasons are also usable when we consider that______________.(exmaples:___________).
From the above you might got idea that I agree______________.(repeat the above three reason____________).So, it is sagacious to support the statement that it is better to _______________.
作文文套六
Agree or disagree
Some people prefer to A, others believe B, Nowadays some may hold the opinion that ________________, but others have a negative attitude. As far as I am concerned, I agree/disagree that_______________. MY arguments for this point are listed as follows.
One of the primary causes is that_______________________.
But there is a fruther more subtle point we must consider. Examples.
What is more_______________. Examples___________
General speaking, __________. Recongizing the fact that _______________should drive us to conclude that______________.
作文文套七
In my point of view, A is as important as, if not more important than B. So it is sagacious to choose A. Among count less factors which influence A. there are three conspicuous aspects as follows.
The above point is certainly true if A is considered. For exmaple,___________________
Another reason why I agree with the above statement is that I believe that A is better than B. For instance,_______________ It would probably not be too kindly disposed to the idea that B is not important .
In a word, to choose A or B is something of a dilemma to the public because they sometimes are confused by the seemingly good qualities of B, and neglect hte genuinely good aspects of A. For the reasons presented above, I strongly commit to the notion that A, but not B.
作文文套八
A or B
When faced with the decision of A or B, quite a few would claim that A, but others, in contrast, deem B as the premier choice and that is also my point. This quite different view is based on the propensity of following points.
We may look into every possible reason, however, fore most reason for B is ____________________. For example, ______________. Also, ________________________.
This is arbitray to judge B according only to the excuse I mentioned in the above paragraph.
Similarly, these reasons are also usable when we consider that________________.
Admittedly, __________________A也有好的地方______________.By he same token, however, ______________B更好____________.Taking into account of all these factors, we may reach the conclusion that_____________.
作文文套九
When it comes to______________, Nevertheless, in my part, I prefer A rather than B as my inclination. My arguments for this point are listed as follows.
I agree with the statement that _________without reservation since___________.
Naturally___________.It can be given a concrete example__________.
A more essential factor why I advocate the argument of __________is that. Obviously ________________.Take the case of a thing that____________.
Futhermore, what is worth noticing fact is that ________________. This demonstrates the undeniable fact that__________________.
Of course, choosing B also has advantages to some extent,_______________此处论述B的1-2优点___________.But if all these factors are contemplated, the advantages of A carry more weight than those of B. From what has been discussed above, we may finally draw the conclusion that_____________.
作文文套十
____________改写并复述题目____________. There may be by one or two disadvantages to ___________________; however, I believe that there are far more advantages. My arguments for this point are listed as follows.
First of all, perhaps one disadvantages to____________is that______________.For instance, __________________. Another drawback to _____________involves the possibility that____________. For example, ____________.
Even though there may be one or two disadvantages to____________, the advantages far outweigh them. The main reason for my propensity for __________is that _________. For exmaple_____________.
Another reason for my inclination for _____________ is that _________________. For example, _________________.
In a word, in spite of the fact that there may be a couple of disadvantages to _____________, I feel that the advantages are more obvious___________.重复优点__________.Taking into account of all these factors, we may reach the conclusion that _____________. 4t s*_ I
作文文套十二
____________改写并复述题目____________.The advantages of B carry more weight than those of A. There are numerous reasons why __________, and I would explore only a few of the most important ones here.
One of the primary cause is that_______________________.
What is also worth noticing fact is that_____________________.
Futhermore, ________________________.
Although I agree that there may be couple of disadvantages to_________________.I fell that the advantages are more obvious_____________. _______________, Given the factors I have just outlined, I can only say that___________________.
作文文套十三
A or B
____________改写并复述题目____________.When faced withe decision of A or B, quite a few would claim that ___________, but others, in contrast, deem A/B as the premier choice and that is also my point. Among countless factors which influence _________, there are three conspicuous aspects as follows.
The main reason for my propensity for ________________ is that _____________.
A or B
From my point of view, it is advisable to choose A rather than B. My arguments for this point are listed as follows.
The main reason for my propensity for ____________________ is that ________________.
There is another factor that deserves some words here.
In a word, ________________________. While it is true that the argument, I disagree hold a little bit of water, I think_______________.
作文文套十五
agree or disagree
Nowadays, some may hold the opinion that ____________________. But others have a negative attitude. As far as I am concerned, I agree that ____________. My arguments for this point are listed as follows.
I agree with the statement that ______________________without reservation since ________________.
Another reason why I agree with the above statement is that I believe that________________.
In a word, _________________________. Taking into account of all these factors, we may reach the conclusion that__________.

其实都行~但注意前后一致~
我考的时候用的一般现在时~

据很多人说是总共写个30片就够了.但是我写了前四十,考得时候俩题都没见过,写得一塌糊涂啊.其实就是看个人的水平啦,基础好的话,几篇就行了.

第一题：
分类讨论：
令下底为40cm
因为10乘以10减去8乘以8开根号等于6
又17乘以17减去8乘以8开根号等于15
所以上底为（40-6-15）cm或（40-6+15）或（40+6-15）或（40+6+15）四种情况
所以面积为：（19+40）乘以8除以2或（49+40）乘以8除以2或（31+40）乘以8除以2或（61+40）乘以8除以2
结果为（236）或（356）或（284）或（404）
第二题：
为什么有四种可能呢?因为可能是等边三角形!
先解出方程得到解为5或6
所以分类讨论（5 5 5）或（6 6 6）或（5 6 5）或（6 5 6）
所以求出三角形的内心与A B C三点的距离分别为
（6分之5倍根号3）或（238分之47倍根号119）或（8分之25）或（根号3）
所以最短距离分别为这些结果的3倍,自己算吧!
把分给我吧,我急需!

这取决于你的模板和引物的关系,以及扩增效率.
如果引物是从模板的两端开始,也就是扩出的产物和模板一样,那么总的拷贝数为A*（1+Y）^N(其中A为初始拷贝数,Y为扩增效率,N为扩增循环数)
如果是从大的双链DNA模板中扩增一个小片段,期望的目的产物首先在第2个循环后第3个循环时出现,然后扩增产物呈指数增长,同时非特异扩增产物是线性扩增的,需要注意的是非特异产物在下轮会产生一个特异产物.为方便理解我先假设扩增效率Y=1,初始拷贝数A=1,做一下推导.注：以双链算一个分子.
第1轮后：目的产物：0,非目的产物：1
第2轮后：目的产物：0+1,非目的产物：2
第3轮后：目的产物：2+2,非目的产物：3
第4轮后：目的产物：8+3,非目的产物：4
.
第N轮 后：目的产物：(2^N)-N-1,非目的产物：N
（+号前面是目的产物扩增,加号后为非目的产物扩增）
所以体系中总分子数为：(2^N)-N-1 + N +1（模板）=2^N
非目的产物为：N
目的产物为：(2^N)-N-1
如果考虑A和Y的话,就将上面的数字乘A,2用1+Y代替.

　　更像零碧轨.闪轨的羁绊也是选择的,而且范围比零碧轨更加广,有10多人- -,男主虽然也有略沉重的过去,但感觉比起上面的每一个人都要来得轻松了.

DNA有终止子的,扩增到终止子的地方就停止了.具体终止子怎么把它终止的,看生化课本吧.不同物种的DNA也不一样.
一般给你碱基序列的那条模板,假设为A链,它的互补链是B链.
第一次延伸：上游引物是识别B链往下延伸的,它延伸出来的碱基序列跟A链一样.下游引物是识别A链往下延伸,它延伸出来的序列跟B链一样.
5'----------------3’A
3------5 上游引物
下游引物5------3
3'----------------5'
第二次延伸：新合成的链同原始的模板一样也可作为模板扩增.

你看一下你的标签是不是有问题（正常的情况是先有一个,再有一个),如果说少了其中一个或是一个出了问题（比如说两个都写成了这样：）,就会出你的那个提示了.
你看看是不是能解决你的问题.

2.48+14.88=17.36

没有..只能靠自己多练了

1.画一条水平线
2.按照扇形,连续画10个19度角（在水平线上方,反时针方向）.从水平线开始.第10个19度被水平先穿过.分为2部分.上面是9度,下面是10度.
3.再按照扇形在水平线的下方同样画10个19度的角（顺时针）.模板的顶点和上一部的位置要在同一点.
4.第二次画的第10个19度角和第一次画的第10个角大部分重合.第二次的是水平线下面是9度,上面是10度.正好和第一次画的角有一度的差.

最好是结合意思,当让如果时间允许,平时多积累一些好的句型和句子,一篇作文中出现一些高级词汇和复杂的句型是可以加分的.加油!

不太说酶的问题
RNA翻译 一般由核糖体来完成,其中有5S、5.8S等RNA做支架
mRNA只是模板,tRNA作为转运RNA把氨基酸搬到一起

解题思路：用模板连续画19个19°的角，得到361°的角，去掉360°的周角，即得到1°的角．

能，
理由是：用模板连续画19个19°的角，得到361°的角，去掉360°的周角，即得到1°的角．

点评：
本题考点： 角的计算．

考点点评： 本题考查了角的有关计算的应用，主要考查学生的理解能力．

1：投诉信
Dear_______,
I am . (自我介绍) I feel bad to trouble you but I am afraid that I have to make a complaint about_______.
The reason for my dissatisfaction is ______________(总体介绍). In the first place,_________________________(抱怨的第一个方面). In addition, ____________________________(抱怨的第二个方面). Under these circumstances, I find it ___(感觉) to ____________________________(抱怨的方面给你带来的后果).
I appreciate it very much if you could_______________________(提出建议和请求), preferably __________(进一步的要求), and I would like to have this matter settled by ______(设定解决事情最后期限).
Thank you for your consideration and I will be looking forward to your reply.
Yours sincerely
Li Ming
2：询问信
Dear ______,
I am _________________________(自我介绍). I am writing to see if it is possible for you to provide me with information regarding_______.(要询问的内容)
First of all, what are _________________________________?(第一个问题) Secondly, when will________________________________?(第二个问题) Thirdly, is _________________?(第三个问题)
I would also like to inquire _________________________________(将最重要的问题单独成段). Could you be so kind as to send me some relevant booklets on the above-mentioned aspects?
Thank you for you kindness, and your prompt attention to this letter will be highly appreciated.
Yours sincerely
Li Ming
3：请求信
Dear___________,
I am writing to formally request to___________(请求的内容)
The reason for ______________is that______________________________（给出原因）.I________, so I ___________________________________(给出细节)
I would also like to request ________________________(提出进一步的要求). I am sorry for any inconvenience I have caused.
Thank you for your attention to these requests. If you have any questions, do not hesitate to contact me at____________(电话号码). I look forward to a favorable reply.
Yours sincerely
Li Ming
4：道歉信
Dear ___________,
I am truly sorry that_________________________(道歉的原因).
The reason is that ______________________________________(介绍原因) Once again, I am sorry for any inconvenience caused. Hope you can accept my apologies and understand my situation.
Yours sincerely
Li Ming
6：建议信
Dear ___________,
You have asked me for my advice with regard to _______, and I will try to make some conductive suggestions here.
In my humble opinion, you would be wise to take the following actions:_________________(建议的内容)
I hope you will find these proposals useful, and I would be ready to discuss this matter with you to further details.
Good Luck with your_______(祝愿)
Yours sincerely
Li Ming
7.求职信
Dear Sir or Madam,
I write this letter to apply for the position that you have advertised in____________(报纸名称)of________(广告发布时间).
Not only do I have the qualifications for this job, but I also have the right personality for a __________(工作名称). In the one hand,_______________________________(第一个原因). On the other hand, __________________________________(另一个原因).
Should you grant me a personal interview, I would be most grateful. If you need to know more about me, please feel free to contact me at any time at _______________(电话号码)
Thank you for considering my application, and I am looking forward to meeting you.
Yours sincerely
Li Ming
8：邀请信
Dear________,
There will a ________________(内容) at/in________________(地点) on___________(时间). We would be honored to have you there with us.
The occasion will start at ___________(具体时间). This will be followed by a _______(进一步的安排). At around______(时间),____________________________(另一个安排)
I really hope you can make it. RSVP before ____________(通知你的最后期限)
Yours sincerely
Li Ming
一、英语书信的常见写作模板
开头部分：
How nice to hear from you again.
Let me tell you something about the activity.
I’m glad to have received your letter of Apr. 9th.
I’m pleased to hear that you’re coming to China for a visit.
I’m writing to thank you for your help during my stay in America.
结尾部分：
With best wishes.
I’m looking forward to your reply.
I’d appreciate it if you could reply earlier.
二、口头通知常见写作模板
呼语及开场白部分：
Ladies and gentlemen, May I have your attention, please? I have an announcement to make.
正文部分：
All the teachers and students are required to attend it.
Please take your notebooks and make notes.
Please listen carefully and we’ll have a discussion in groups.
Please come on time and don’t be late.
结束语部分：
Please come and join in it.
Everybody is welcome to attend it.
I hope you’ll have a nice time here.
That’s all. Thank you.
三、议论文模板
1.正反观点式议论文模板
导入：
第1段：Recently we’ve had a discussion about whether we should... （导入话题）
Our opinions are divided on this topic.（观点有分歧）
正文：
第2段：Most of the students are in favour of it.（正方观点）
Here are the reasons. First... Second... Finally...(列出2~3个赞成的理由)
第3段：However, the others are strongly against it. （反方观点）
Their reasons are as follows. In the first place... What’s more... In addition...(列出2~3个反对的理由)
结论：
第4段：Personally speaking, the advantages overweigh the disadvantages, for it will do us more harm than good, so I support it.（个人观点） オ
2.“A或者B”类议论文模板：
导入：
第1段： Some people hold the opinion that A is superior to B in many ways. Others, however, argue that B is much better. Personally, I would prefer A because I think A has more advantages.
正文：
第2段：There are many reasons why I prefer A. The main reason is that ... Another reason is that...(赞同A的原因)
第3段: Of course, B also has advantages to some extent... (列出1~2个B的优势)
结论：
第4段: But if all these factors are considered, A is much better than B. From what has been discussed above, we may finally draw the conclusion that ...(得出结论) オ
3.观点论述类议论文模板：
导入：
第1段：提出一种现象或某个决定作为议论的话题
As a student, I am strongly in favour of the decision. （亮明自己的观点是赞成还是反对）
The reasons for this may be listed as follows. （过渡句,承上启下）
正文：
第2段：First of all... Secondly... Besides...(列出2~3个赞成或反对的理由)
结论：
第3段：In conclusion, I believe that... （照应第1段,构成"总—分—总"结构）
4."How to"类议论文模板：
导入：
第1段：提出一种现象或某种困难作为议论的话题
正文：
第2段： Many ways can help to solve this serious problem, but the following may be most effective. First of all... Another way to solve the problem is ... Finally...(列出2~3个解决此类问题的办法)
结论：
第3段：These are not the best but the only two/ three measures we can take. But it should be noted that we should take action to...(强调解决此类问题的根本方法)
四、图表作文写作模板
The chart gives us an overall picture of the 图表主题. The first thing we notice is that 图表最大特点 . This means that as (进一步说明).
We can see from the statistics given that 图表细节一 . After 动词-ing 细节一中的第一个变化, the动词-ed+幅度+时间(紧跟着的变化) . The figures also tell us that图表细节二 . In the column, we can see that accounts for (进一步描述).
Judging from these figures, we can draw the conclusion that (结论). The reason for this, as far as I am concerned is that (给出原因). / It is high time that we (发出倡议).
五、图画类写作模板：1.开头
Look at this picture./The picture shows that.../From this picture, we can see.../As is shown in the picture.../As is seen in the picture...
2.衔接句
As we all know, .../As is known to all,.../It is well known that.../In my opinion,.../As far as I am concerned,.../This sight reminds me of something in my daily life.
3.结尾句
In conclusion.../In brief.../On the whole.../In short.../In a word.../Generally speaking.../As has been stated...











写作必背基本句式
1． 表明观点与看法
1) People have (take, adopt, assume) different attitude towards sth.
2) People have different opinions on this problem.
3) There exist different opinions on this problem.
4) People take different views of (on) the question.
5) Some people believe that…Others argue that…
2． 说明重要、必要、困难、方便、可能
1) It is important (necessary, difficult, convenient, possible) for sb. to do sth.
2) We think it necessary to do sth.
3) It plays an important role in our life.
3． 表述利弊或好坏
1) It has the following advantages.
2) It does us a lot of good.
3) It benefits us quite a lot.
4) It is beneficial to us.
5) It is of great benefit to us.
6) It has more disadvantages than advantages.
7) It does us much harm.
8) It is harmful to us.
4． 解释原因与结果
1) There are three reasons for this.
2) The reasons for this are as follows.
3) The reason for this is obvious.
4) The reason for this is that…
5) We have good reason to believe that…
6) The reason for this is not far to seek.
5． 承认事实与现状
1) We cannot ignore (the fact) that…
2) No one can deny (the fact) that…
3) There is no denying (the fact) that…
4) This is a phenomenon that many people are interested in.
5) However, that’s not the case.
6． 表示变化与比较
1) Some changes have taken place in the past five years.
2) A great change will certainly be produced in the world’s communications.
3) The computer has brought about many changes in education.
4) Compared with A, B…
5) I prefer to read rather than watch TV.
6) There is a striking contrast between them.
7． 表达数量增与减
1) It has increased (decreased) from …to…
2) The population in this city has now increased (decreased) to 800,000.
3) The output of July in this factory increased by 25% compared with that of January.
8． 采取方法与措施
1) We should take some effective measures.
2) We should try our best to overcome (conquer) the difficulties.
3) We should do our utmost in doing sth.
4) We should solve the problems that we are faced with.
9． 引用名言、名谚与名理
1) It’s well known to us that…
2) As is known to us, …
3) This is a topic that is being widely talked about.
4) From the graph (table, chart) listed above, it can be seen that..
5) As a proverb says, “Where there is a will, there is a way.”
10． 表示结论与归纳
1) In short, it can be said that…
2) In conclusion, I’d like to thank…
3) It may be briefly summed up as follows.
4) From what has been mentioned above, we can come to the conclusion that…

（1）用△ABC和△A1B1C1拼成一个平行四边形AB(C1)C(B1)A1,连接AA1就是BC边上的中线.
理论,平行四边形对角线互相平分.
（2）把模板的B1C1边与BC边重合,再连接AA!两点可得其高线.

见附件,帮你设置了公式

我觉得写作如果要提高,要尽量避免使用模板.其次就是不断的修改,然后根据新东方段琛老师给我们在课上讲解的那些论点,以及帮助我们分析雅思写作的那些套路,构造一个很好的结构.论据解释要详细,有说服力,论点要准确,有力度.

答案是：D .RNA 通过核孔转移到细胞质中.
A .DNA 分子的复制 肯定会出现碱基互补配对；
B ．目的基因与运载体结合时,黏性末端处也会出现碱基互补配对；
C ．以 mRNA 为模板合成蛋白质时,mRNA上的碱基与tRNA上的三个反密码子进行碱基互补配对；
D .RNA 通过核孔转移到细胞质中就没有碱基互补配对了.

纯手打望采纳
How I've changed
My life has changed a lot in the last few years.I used to play all day long on the summer holiday.Now I'm hard-working on my study.I used to play with my firends in the park,but now I
often chat with them on QQ.
The biggest change in my life is I like to read books now.This is the most important chnage because this makes me like to study and get knowledge by myself,not by the help of teachers.
有不满意的欢迎追问,我自己打的,所以文章应该不复杂,你应该看得懂.希望能帮上你!

1,将19度的角累加19次,会得到一个361度的角（可能超过360度的角对初中生来说有点难以理解）,也就是,会转一周（360度）后再多出一度,就是所要求的1度角了!
2,因为17与360是互素的,所以一定存在某个整数n,使17重复n次（度数为17*n,这里n=127）后刚好是360的整数倍(这里是6倍)多一度或少一度(此处是少一度,这个问题的正确性是不容置疑的,但是证明要涉及数论知识,有兴趣可以去看看这方面的书)
所以17度的模板可以画出一度的角!
3,21与360度的最大公约数是3,故能作出的最小的角(除零角外),只能是3度!无法作到1度!
所以,21度的模板是画不出来的!
圆规叠合法,我以前没听过,但从你题目的意思来看就是,将有固定度数模板的顶点放在某个圆心上,然后画出角,再以画出的角的一边为界,用模板画出第二个角……所有相邻的角共用一条边,最后会绕着顶点打转转,(和圆规画圆有点相似!)结合周角及模板的度数,就可以求出得出某些度数的角了!

NO₂+H₂O----HNO₃+NO
KNO₃----KNO₂+O₂
NH₄NO₃----N₂+HNO₃+H2O
KClO₃+HCl----KCl+H₂O+Cl₂

绝大多数情况下可以,但一般要稀释
个别情况下需注意,譬如你的PCR产物纯化后直接做电转,此时要注意你的模板质粒是否会同时发生转化影响筛选

错误！
因为PowerPoint 2000中的空演示文稿模板是允许用户修改的

D

B

清包就是包工不包料及其它,所以你只能按清单计价工日含量*每工日的价格,（因清单价格内含有材料及机械费.）==清包总价（最好加些带班管理费）你那样算是不准确的,简言之就是做工天数*每天价格+管理费==清包总价!

设宽是X厘米,则长是2X厘米
x+2x+x+2x=54
6x=54
x=9
宽9厘米,长18厘米
面积=9*18=162(平方厘米)

知识目标：说明兔与其生活环境相适应的形态、结构和生理功能；
举例说明其他陆地生物如何适应陆地环境；
能力目标：自主发现问题、提出问题并解决问题
情感目标：形成保护环境,与动物和谐共处的意识

每次锤击能量守恒
设阻力为f深度为d
则f=kd
w=fd=1/2kd^2
w=w时d=1
带入求得k为2w
当w=2w时
d=根号2

你的语感太强了,佩服你

你的问题说得不够明确啊.1000个氨基酸对应3000个信使RNA.3000个信使RNA对应6000个DNA.而转录出这段肽链的基因包含6000个以上的DNA.

对劳务个人砼接触相加,对于承包不管清单与定额算投影面积

词语搭配不当、词语（关联词等）使用不当,成分残缺（主语、宾语、谓语、补语、状语等）,语序不当,语句重复、多余,等词语搭配和使用不当,就要换词语,包括形容词与名词的搭配（例：美丽的音乐应该为动听的音乐 等）,成分残缺那就要补充了,（例：从东边升起应该为太阳从东边升起 等）,语序不当应调换,语句、词语重复要删掉一些,例：能否……是……的保证 应该为 能……是……的保证）还有一些想不起来了,

一、课前系统部分 （一）教材分析教材分析部分的写作要求： （1）分析《课程标准》的要求.（2）分析每课教材内容在整个课程标准中和每个模块（
每本教材）中的地位和作用.（3）分析教材内容（二）学生分析学生分析部分的写作要求： ：（1）分析学生已有的认知水平和能力状况.（2）分析学生存在的学习问题.（3）分析学生的学习需要和学习行为.
（三）教学目标教学目标部分的写作要求： （1）确定知识目标.（2）确定能力、方法培养目标及其教学实施策略.（3）确定引导学生情感、态度、价值观目标的教学选点及其教学实施策略. A、述必须具备的四个基本要素：行为主体主体必须是学生而不是老师, （二） 一课的教学目标设计为： （1）知识与能力： （2）过程与方法：（3）情感态度与价值观（四）教学重点与难点教学重点与难点部分的写作要求：两个操作要求：（1）确定本堂课的教学重点.（2）确定本堂课的教学难点.
（五）教学方式 （六）教学用具 二、课堂系统部分——教学过程 三、课后系统部分——教学后记教学后记

与T载体连接很容易的,不用考虑那么复杂的因素
只要你回收的PCR产物电泳后能看到带,连接基本都能成功

方格网法土方计算
由方格网来计算土方量是根据实地测定的地面点坐标（X,Y,Z）和设计高程,通过生成方格网来计算每一个方格内的填挖方量,最后累计得到指定范围内填方和挖方的土方量,并绘出填挖方分界线.
系统首先将方格的四个角上的高程相加（如果角上没有高程点,通过周围高程点内插得出其高程）,取平均值与设计高程相减.然后通过指定的方格边长得到每个方格的面积,再用长方体的体积计算公式得到填挖方量.方格网法简便直观,易于操作,因此这一方法在实际工作中应用非常广泛.
用方格网法算土方量,设计面可以是平面,也可以是斜面,还可以是三角网,如图8-38所示.
图8-38 方格网土方计算对话框
1、设计面是平面时的操作步骤：
l用复合线画出所要计算土方的区域,一定要闭合,但是尽量不要拟合.因为拟合过的曲线在进行土方计算时会用折线迭代,影响计算结果的精度.
l选择“工程应用方格网法土方计算”命令.
l命令行提示：“选择计算区域边界线”；选择土方计算区域的边界线（闭合复合线）.
l屏幕上将弹出如图8-38方格网土方计算对话框,在对话框中选择所需的坐标文件；在“设计面”栏选择“平面”,并输入目标高程；在“方格宽度”栏,输入方格网的宽度,这是每个方格的边长,默认值为20米.由原理可知,方格的宽度越小,计算精度越高.但如果给的值太小,超过了野外采集的点的密度也是没有实际意义的.
l点击“确定”,命令行提示：
最小高程=XX.XXX ,最大高程=XX.XXX
总填方=XXXX.X立方米, 总挖方=XXX.X立方米
同时图上绘出所分析的方格网,填挖方的分界线(绿色折线),并给出每个方格的填挖方,每行的挖方和每列的填方.结果如图8-39所示.
图8-39 方格网法土方计算成果图
2、设计面是斜面时的操作步骤：
设计面是斜面的时候的,操作步骤与平面的时候基本相同,区别在于在方格网土方计算对话框中“设计面”栏中,选择“斜面【基准点】”或“斜面【基准线】”

如果设计的面是斜面（基准点）,需要确定坡度、基准点和向下方向上一点的坐标,以及基准点的设计高程.
点击“拾取”,命令行提示：
点取设计面基准点:确定设计面的基准点；
指定斜坡设计面向下的方向:点取斜坡设计面向下的方向；

如果设计的面是斜面（基准线）,需要输入坡度并点取基准线上的两个点以及基准线向下方向上的一点,最后输入基准线上两个点的设计高程即可进行计算.
点击“拾取”,命令行提示：
点取基准线第一点:点取基准线的一点；
点取基准线第二点:点取基准线的另一点；
指定设计高程低于基准线方向上的一点:指定基准线方向两侧低的一边；
方格网计算的成果如图8-39.
3、设计面是三角网文件时的操作步骤：
选择设计的三角网文件,点击“确定”,即可进行方格网土方计算.

首先,三角板是直角三角形
设另一边长为t
1）x在边长为4的边上
有x+4t/3=4,t=3-3x/4,y=xt=3x-3x^2/4
取值范围(0,4)
2）x在边长为3的边上
有x+3t/4=3,t=4=4x/3,y=xt=4x-4x^2/3
取值范围(0,3)
3）x在边长为5的边上
有x+3t/4+4t/3=5,t=12/5-12x/25,y=xt=12x/5-12x^2/25
取值范围(0,5)