好链接的一篇文章里插入几个关键词呢?

有一个字母打错了吧,如果改为DH比较好,
由菱形的性质,AC与BD互相平分,O是DB的中点,因为DH直AB,OH为斜边上的中线,OH=OD,则∠ODH=∠OHD,又CD∥AB,∠CDB=∠DBA
∠DCO=90-∠CDB；∠BDH=90-∠BDH ；所以∠DCO=∠BDH=∠DHO

记Aij为第i行、第j列的数
从上往下看：第一列为首项为1、公差为0的等差数列；
第二列为首项为1、公差为1的等差数列；
第三列为首项为1、公差为2的等差数列；
第四列为首项为1、公差为3的等差数列；
……
第j列为首项为1、公差为j-1的等差数列；
所以,Aij=1+（j-1）*（i-1）
第一空为,Aii=1+（i-1）^2;
1+（j-1）*（i-1）=100
(j-1)*(i-1)=99=1*100=3*33=9*11=11*9=33*3=100*1
第二空为,100出现6次.

我的星期天-During Sundays2009-03-14 12:08以前的星期天我基本都玩过去了,可是现在我的星期天变得有意义多了.事情是这样的：有一次老师带领我们去参观福利院,那里住的都是没有爸爸妈妈的孤儿.他们真可怜呀!有的儿童已经到了上学的年龄,可是他们仍没有背上书包.于是我想,我们家离福利院很近,我可以每个星期天去一次,然后把我上课学到的东西教给他们.这多有意义啊.当我把这个想法告诉老师时,她同意了.从那以后我就是那里的义务小老师了.
During Sundays
I used to idle away my Sundays.But now I have more meaningful thing to do.One day our teacher took us to visit the Welfare House.There lived the orphans.Some of them are of school age already.But they don’t have the chance to go to school yet.So why couldn’t I teach them what I had learnt in the classes on Sundays?My home is close to the Weffare House.Wasn’t it a good idea?
When I told my teacher this,she looked at me with a yes on her face.From then on,I act as a little voluntary teacher there on Sundays.

你是不是在民进上课的!来握把手!

物质守恒定律说,物质不会凭空产生,也不会凭空消失,只会从一个种形态转化成另一种形态.
核反应后,物质以光的形态存在,而光也是一种物质,同时释放能量.

动能与动量的物理意义：
图片打不开
在P-V关系图像中取微元△V,对应的△P=△F*△T 这段时间内的功W=
求和△W=S△F*△T*△V=SP*V S是积分符号

连接四边形ABCD的对角线,可以证明AC与三角形ABD和三角形BCD两个中位线平行,同理亦可证明EF// GH ,两对边平行,则四边形EFGH是平行四边形

这句话并不是定语从句,而是定语后置.因为句中的定语（different ...effects）为形容词+介词短语,长度太长,所以需要后置.
试比较你的原句和：some snakes manufactured a different poison.
或者比较以下两句：
(1) He is a boy big enough to take care of his mom.
(2) He is a big boy.

1,延长PC至D使CD＝PB.则⊿ABP≌⊿ACD（SAS）.⊿APD是等腰直角三角形.PC+PB＝PD＝√2PA.2, PC-PB＝√2PA.3, PB-PC=√2PA4.⊿APC用正弦定理得,sin∠ACP＝1/√5.⊿APB用正弦定理得,PB＝1&n...

因为
六又八分之五=6.625
六又二十五分之十六=6.64
6.625

my thready：我的线程（线程是"进程"中某个单一顺序的控制流.也被称为轻量进程（lightweight processes）.计算机科学术语,指运行中的程序的调度单位.线程是进程中的实体,一个进程可以拥有多个线程,一个线程必须有一个父进程.）；
my alert：我的提示信息（alert :是javascript 中用到了一种脚本语言!其主要用法就是在你自己定义了一定的 函数以后.通过 执行相应的操作 ,所弹出对话框的语言!）；
my settings：我的设置.

1-10 ABDCC CCCBC
11-20 DDACB DBCAC
21-30 DCCBC DDAAC
31-40 ABBCA BBAAC
还是晚了 谁对的多给谁呗...

346公顷（MapSource中输入各点就行了）

用来检修一条母线用,当一条母线停电时,可以倒闸操作到二母线.

看一下是不是这里

不可以的,因为苯环中的C是以SP2杂化,三个轨道呈平面三角.其中两个与苯环中其他C相连,形成平面的六边形,另外一个与甲基成键.所以与苯环直接相连的任何原子都是与苯环共平面的（当然,特殊空间结构下,有些会略微偏离）.
苯环中C上没有参与sp2杂化的p轨道,垂直于苯环,共轭形成大π键,因为这个轨道已经有2个电子,是充满的,不与第四个原子成键了,所以甲基不能垂直于苯环.

你说的那段是 纪伯伦《先知》的第22章,英文如下：
(22)On Good & Evil
On Good & Evil
And one of the elders of the city said, "Speak to us of Good and Evil."
And he answered:
Of the good in you I can speak, but not of the evil.
For what is evil but good tortured by its own hunger and thirst?
Verily when good is hungry it seeks food even in dark caves, and when it thirsts, it drinks even of dead waters.
You are good when you are one with yourself.
Yet when you are not one with yourself you are not evil.
For a divided house is not a den of thieves; it is only a divided house.
And a ship without rudder may wander aimlessly among perilous isles yet sink not to the bottom.
You are good when you strive to give of yourself.
Yet you are not evil when you seek gain for yourself.
For when you strive for gain you are but a root that clings to the earth and sucks at her breast.
Surely the fruit cannot say to the root, "Be like me, ripe and full and ever giving of your abundance."
For to the fruit giving is a need, as receiving is a need to the root.
You are good when you are fully awake in your speech,
Yet you are not evil when you sleep while your tongue staggers without purpose.
And even stumbling speech may strengthen a weak tongue.
You are good when you walk to your goal firmly and with bold steps.
Yet you are not evil when you go thither limping.
Even those who limp go not backward.
But you who are strong and swift, see that you do not limp before the lame, deeming it kindness.
You are good in countless ways, and you are not evil when you are not good,
You are only loitering and sluggard.
Pity that the stags cannot teach swiftness to the turtles.
In your longing for your giant self lies your goodness: and that longing is in all of you.
But in some of you that longing is a torrent rushing with might to the sea, carrying the secrets of the hillsides and the songs of the forest.
And in others it is a flat stream that loses itself in angles and bends and lingers before it reaches the shore.
But let not him who longs much say to him who longs little, "Wherefore are you slow and halting?"
For the truly good ask not the naked, "Where is your garment?" nor the houseless, "What has befallen your house?"

你指的是高压输电线路吧,那个叫绝缘子,常用的三种：
1、瓷绝缘子,可以多个串接构成绝缘子串,用以耐受不同的电压；
2、玻璃绝缘子,和瓷的类似,也可以构成绝缘子串；
3、合成绝缘子,材质是硅橡胶,整体一根,长度依电压而定,和前两个差不多.

1.化学本质都是蛋白质,
2.合成位置一般都在核糖体内.
3.作用：
解旋酶：就是作用DNA的,一般用在PCR技术中来打开一些DNA的二级结构.例如一些发卡结构,有利用DNA的复制.
DNA聚合酶：在PCR过程中,以DNA或cDNA为模板,以引物,dNTP,Mg2+等试剂为原料复制DNA所用到的一种不可或缺的酶.
RNA聚合酶和DNA聚合酶一样,只是他是用来复制RNA的.
逆转录酶：以RNA为模板,把RNA转变为单链的cDNA.以利于后续的DNA克隆以及文库构建.
限制酶：就是通常所说的限制性内切酶,不同酶的作用位点不一样切断DNA,一般用于分子克隆与载体构建等基因工程技术.
DNA边接酶：就是将限制性内切酶切断的DNA片断又重新连接成一条DNA.连接的DNA片断一定是同一个限制性内切酶切割产生同样粘端的片段,或者是不同酶切割产生平端的片段,但是这样的连接效率一般较低.
4.这些酶一般通过克隆,表达获得.存在不同生物体内.

6.设通讯员骑自行车的时间为th
15(t-2/5)=12(t+1/4)
t=3
s=15*(3-2/5)=39(km)
7.设火车速度为vm/s
(300+10v)/25=v
v=20
s=vt=20*10=200m

分两种情况：一种是点E在A的外侧,此时∠BEC+∠ABE+∠ACE=∠BAC
另一种情况是点E在BC外侧,此时∠BEC+∠ABE+∠ACE+∠BAC=360度

声波在理想气体中的传播可认为是绝热过程,由热力学理论可以导出其速度为

式中 R——摩尔气体常数（R=8.314J/mol•K）；
r——比热容之比（气体定压比热容与定容比热容之比）；
μ——分子量；
Tk——气体的开氏温度.
考虑到开氏温度与摄氏温度的换算关系Tk=T0+t,有

在标准大气压力下,t=00C时,u0=331.45m/s,因此

式中,T0=273.14K.
http://www.***.com.cn/qikan/periodical.Articles/DXWL/dxwl99/dxwl9903/990305.htm

居里夫人凭借着自己的坚强、意志的纯洁,律己之严,客观,公正不阿的判断,让我的心灵为之震动,这些无数人一生追求的品质就在居里夫人身上完美的融合了,作为科学世界的领航者,她不仅是化学的骄傲,更是我们人类的骄傲.我为我们有这样一位伟大的女科学家而自豪!她的美好品质更是值得我们去学习,去发扬.因为：人类正是靠着这些居里夫人拥有的品德力量和热忱,才能继续进步.我敬佩居里夫人,更希望继承和发扬她的科学品质!

1.设△ABC中,作高AD在Rt△ACD中,可得AD＝bsinC∴S＝BC*AD/2=（absinC）/2说明,在课本中,这个公式是把△ABC放在直角坐标系中进行推导的.这样做的好处是包括了∠C是钝角的情况.2.根据正弦定理,c/sinC=2r∴ sinC＝c/2r...

应该是作某些动词的宾语：V+ wh- ＋ to do
这些动词有：know,decide,learn,remember,see,understand,explain,find out,wonder,think,discuss,guess,inquire,observe,show,tell…
例如：i don't know what to do next 我不知道下一步该做什么

我明天就会给你重新邮件XXL的Jersey,相信等待几天你就能收到,我会发一个修改差评的链接给你,还希望你能帮助我修改差评,我是一个诚实的商人.
Hello.I will send you a Jersey in size XXL tomorrow and I believe you can receive it in a few days.I will also send you a link to revise your bad remark and I hope you can help me revise the bad remark.I am an honest businessman.Thank you very much!

影子方向始终与太阳光的方向相同 当你在向太阳半面是 指向北极点的所以向北
过极点另一侧影子是背向极点的

若斜面体P受到的弹簧弹力F等于其重力mg,
则MN对P没有力的作用,P受到2个
力,A对；若弹簧弹力大于P的重力,则MN对P有压
力FN,只有压力FN则P不能平衡,一定存在向右的力,
只能是MN对P的摩擦力Ff,因此P此时受到4个力,如图(b)所示,C对.

Although he's nearly 80,he is still very active.=He is still very active,although he's nearly 80.尽管快80岁了,他还是十分活跃.although不与but连用

（1） 正极；（2：2CuSO ₄ +2H ₂ O 2Cu+2H ₂ SO ₄ +O ₂ ↑，
（3）1：1 （4）银，AgNO ₃ （5） Y极附近红褐色变深．


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涓嬮潰鏄?叏閮ㄧ殑缈昏瘧.璇风瑧绾?
Where can I encountered seven Aberdeen (full text)
(A)
In the process of growth,we will encounter a lot of things,if it is happy not to Deyiwangxing,or getting too much; if it is painful,do not complain,because it will be the others will never be able to take the post of your wealth.
Is that your wealth - there are always older predecessors instill this concept to me.
I was smiling by Dian Zhuotou land,but in his heart whispered to Ma Zhao,"You have to feel so good,I left all the wealth of hello."
In any case,not of wealth.
(B)
Impression can recall,there are so few things that I always remind myself that we must forget,as nothing happened,my life had not been made,said the impact of.
They have been directly or indirectly,changed my track to grow.
(C)
On one occasion.In the approach of test results at the upper and middle reaches of the table after I asked math questions,teachers did not know where to jump up,angrily said:"Wang Moumou a good review,Do not waste valuable time on him."
59 students in his class,59 pairs of eyes stare back together.I will never forget that moment for all,Fangruo nailed me,the sadness,pity,ridicule and something more to say,watch the eyes ....
The humiliation did not play a lot of stories inside of the scenes are bound to happen - the main character has been in a lot of humiliation after the beginning of the high level,the extraordinary final play,cum laude admitted to a well-known schools,the snow was to shame ......
I do not have such a great talent.At the time,I,weary,partial Branch,sensitive and low self-esteem.In addition to Yin Ren at the time of tears,pretend nothing happened,cried a home run,draw any change in their status and fate of the move.
After I began to give up on themselves,then naturally the focus has not admitted to any school.I have to admit that Wang Moumou was indeed a waste of time.I can not say any words of rebuttal.Only to see the "teacher" words will be frowned,smiled and far-fetched.
(D)
There are many such things.For example,when Gao witnessed his best friend was mistaken diagnosis and treatment of a doctor to die; the holidays to find their first job,but that's Pianqian ......
There's.
Perhaps there will be no more.
I also may be forgotten.
These injuries have been deeply in the India head,engraved in mind.With the inter-year-old goes on,like a washed up by many times the clothes were constantly depreciation,increasing yellowing.
(E)
On the very back teeth bite?Strong enough to solve all?It was given a powerful force,it has a strong spiritual support - not the fact.
Just because it can not go back.
(F)
Character often say the fate of the decision.I think this is probably true,at least on the fate of the play can change a lot of impact,right?
If I was able to work hard,perhaps on the Hong Kong Certificate of Education a good school,right?
Had never experienced the death of a friend,I would not be suffering from neurasthenia,right?
Had the company not to be Pian Qian,I may often exercise their own labor,right?
............
濡傛灉.濡傛灉.濡傛灉.濡傛灉.
So,"if" - will not be a Chinese dictionary,you were one of the most frequently used word this?Because carrying too much hope,and never regret,the frequency of use by more than repeated.
But ...
If,after all.
(G)
"On the 7th of the Yangtze",the nagging Xingye over to the small Di said:Although we are poor,but can not lie,can not be beat; is not our thing,we can not hold; to study hard,to be brought up on Useful to the community.Di small that no father to rescue them,old and broken lying on the bed with his arms crying,thinking up these ideas are:If not encountered seven small Di-earners,it will be like now?If we went back to a similar Xingye,or seven-earners,no matter what is the best teacher is also the Friends of the guy,we make the following allegiance to the cloth,then perhaps all will be different,right?
Not to enlarge the pain of youth.Do not look for trouble.
Non-inferiority.No impulse.Fuqi not.
Others do not because of their own to stimulate change.
Do not always look forward to other people "understanding" of their own.Maybe some people will understand,but you may not be really concerned.
Others say,praise or abuse worth,heard passed,no room for complacency,no need for a more tears.
In the absence of verification in person before,do not believe anyone would say.Including your teachers,your parents,but also your classmates and friends.
Some people call you,your friends to call you if you are convey to the - this person is not a true friend.
Regardless of what parents say and do anything,to believe that they will not harm you.If so,they must be the way a problem.
Finally,please take good care of yourself.
(H)
Today - I still do not believe that wealth is gone.
However,I believe,so every time a different choice,we must stand ready to suffer as a result of the choices arising from the cost and pain.
For the young to pay the price.More ignorance and impulse pay the price.
You imprison the youth and superior,after all,to use an adult's hard to make up and go.

加一个and就可以

一般都是四五分钟左右,最长的也只有7分钟.你想要那么长的英语的话还是有点难度的

1．神情　心理　善良、甘愿自己吃苦也要帮助别人的美好
2．她忐忑不安
3．语气中断,语言断断续续

月份前是in.
年前面是in.
日子前面是on.
因为in是不具体指哪一年.
而on是具体指哪天的时间.
所以记住这个道理以后就不必问了.

乘法求导问题,
若f(x)=g(x)·h(x),则f(x)的一阶导数为g(x)的一阶导数×h（x）+g(x)×h(x)的一阶导数.
已知函数：
f（x）=(x^3+3x^2+ax+b)e^(-x)；
f(x)的（一阶）导数
=（x^3+3x^2+ax+b)的导数*e^(-x)+（x^3+3x^2+ax+b）*（e^(-x)）的导数
=（3x^2+6x+a)e^(-x)-(x^3+3x^2+ax+b)e^(-x)
=(-x^3)e^(-x)+(6-a)xe^(-x)+(a-b)e^(-x)

1．我只是微微一笑，依旧写东西；我用手抚一抚它细腻的绒毛。
2．在文中“信赖”指“小家伙”和“我”的亲近、信任、依恋。“美好的境界”指人与动物互相依恋的情意，人与自然融为一体。

月夜、半世。
一个描述写诗心情的作用，一个寄物抒情的作用。

因胸怀远大抱负,所以天下为己任,发愤苦读,或夜昏怠,辄以水沃面；食不给,啖粥而读.既仕,每慷慨论天下事,奋不顾身.乃至被谗受贬,由参知政事谪守邓州.仲淹刻苦自励,食不重肉,妻子衣食仅自足而已.

左边是原电池 这是B就相当于与电源相连 故为电解池
（3）B中作阳极的Cu放电失电子成铜离子 溶液中的铜离子放电得电子成Cu吸附在作阴极的铜电极上 因而溶液中铜离子的浓度未发生改变 故颜色无变化
（4）换成NaCl溶液后,放电的分别是氯离子和水中的氢离子,水的电离平衡被破坏,氢氧根离子富余,故B中ph增大；而A是原电池,酸中的氢离子不断被置换出来,酸性减弱,体现的也是ph增大的过程

1．生命旺盛　蓬勃生机
2．数量　颜色　静

GaN中的成键方式确实是Ga和N各用三个成单电子形成三个共价键,再用Ga的空轨道和N的孤电子对形成第四个共价键——配位键；由于成键后四条化学键无法区分,因此其结构与SiC是一样的,与BN也相同；等价电子体就具有相似的...

In modern society,friendship has close connection with good faith .friend,as a confidant in life,can't revenge in my behind just because some annoyed things.I really wanna know if you treat me as frind?even not,don't do things in absolute terms,every one will get broke out.I think if we at this stage,we won't be friend any more.

只能列出式子设上面的梯形的高为h,则图形的面积分成梯形长方形和三角形面积和
则（8+1）* h 除以2 + 8* （5－h) + 8*3 除以2 ＝4.5h+ 40-8h + 12= 52-3.5h
显然面积与上面的梯形的高有关系.条件不够啊.

Some Taobao distributers added a lot of their website links to our agents spitefully.Fortunately,however,the links had been changed into my own by a software yesterday,just one day wasted.
By the way,I compassionated for the agents who are kept in the dark up till now.

局域网、广域网和城域网

∵AB=AC
∠BAC=120°
∴∠B=30°
∵EF垂直平分AB
∴FB=FA
∴∠FAB=∠B=30°
∴∠AFC=∠B+∠FAB=60°

这是一种有亲水基(铵基)和疏水基(烷基)的相转移催化剂(也叫表面活性剂);在聚合反应中用来从水相向油滴中运送单体的.