（第二版）新视野大学英语第三册Comprehension of the Text 1

xoy面的特征是z=0 所以投影方程该是
x²+y²=0 2x+1=0
xoz面特征是y=0 所以投影方程是
x²-z²=0 2x-z²+1=0

我不知道你题目有没有打错,貌似应该是：
aBCD 42 Abcd 43
ABCd 140 abcD 145
aBcD 6 AbCd 9
ABcd 305 abCD 310
然后解题思路是这样的：
①比较子代的基因型可发现,a-d之间未发生交换,只有aD与Ad两种,因此可以判断a-d是完全连锁的.
②把a-d组合在一起看.根据子代表现型可得Abcd和abCD为亲本类型（数量最多）；aBcD和AbCd为双交换类型（数量最少）；其余为单交换.
根据亲本型和双交换可推断（Ad）位于b、c之间.
双交换值=（6+9）/1000=1.5%
b-(Ad)间交换值=（42+43+6+9）/1000=10%
(Ad)-c间交换值=（140+145+6+9）/1000=30%
b-c间交换值=10%+30%=40%
③并发系数=实际双交换值/理论双交换值=1.5%/（10%*30%）=0.5
完全手打的~所以作图就自己来吧^_^

习题1-3
1.根据函数极限的定义证明:
(1);
分析因为
|(3x-1)-8|=|3x-9|=3|x-3|,
所以要使|(3x-1)-8|0,$,当00,$,当时,有
,
所以.
2.根据函数极限的定义证明:
(1);
分析因为
,
所以要使,只须,即.
证明因为"e>0,$,当|x|>X时,有
,
所以.
(2).
分析因为
.
所以要使,只须,即.
证明因为"e>0,$,当x>X时,有
,
所以.
3.当x®2时,y=x2®4.问d等于多少,使当|x-2|0,
$X1>0,使当xX2时,有|f(x)-A|X时,有|f(x)-A|0,
$d1>0,使当x0-d1

我看了贴吧里面那个人的回答,是错误的,这个题目球心是以支点O转动的,计算时候还是要根据转动的方式来计算,球绕过球心的轴的转动惯量0.4mr^2,再根据平行轴定理可知,球绕过O点垂直于纸面的轴的转动惯量为0.4mr^2+mr^2=1.4mr^2,则球绕该轴的转动动能为0.5×1.4mr^2×(V/r)^2=mgr(1-cosθ)
接触点无相对运动的意思就是纯转动,如果有相对运动那就有滑动了,也就是说球有可能是在接触点滑下去的,而不是题目说的绕O点转动掉下去的.

你引用那么多了,我就打个比方吧,好比说那种推拉式的窗户,要是特别紧,那么是推开,关上都很费力气,要是特别松,很容易关上,那么也是很容易推开的

sectionB的答案只有UNIT 1的,我也找了好久,其他的都找不到.
II CBDDADAC
III hollow considerate vival elastic paralleling inspire manipulate acknowledged soaring respective
IV on qpart with along on into of between up of
这是UNIT 1的答案.

书店一般都会有的,奉劝一句,还是自己做做吧...

原文都没有
马克笔和有色铅笔在设计过程中是很理想的工具，也同样适用于最后的透视图或者绘图。因为许多草图和草稿绘制于薄的描图纸上， 故湿介质笔刷如水彩笔刷和蛋彩笔刷不能用， 因其会弄皱纸张。马克笔干得很快并且不起褶皱，和有色铅笔一起被迅速运用于几乎所有的绘画表面图中。
部分专业术语不太清楚 你自己应该懂得撒

浣犵‘瀹氭槸娴欐睙澶у?鍑虹増鐨勫悧
鎴戝彧鏈夋禉姹熷ぇ瀛︾紪钁 澶栬?鏁欏?涓庣爺绌跺嚭鐗堢ぞ鍑虹増鐨凕br/>Unit One
1.He walked slowly because of his broken leg.
2.Despite his serious illness,he attended the meeting.
3.He saw to it that the same mistakes would not happen any more.
4.Now that they know each other much,they could get along well.
5.I found myself surrounded by five or six boys at this time.
6.On the happy occasion,I give my best wishes to you.
Unit Two
1.I went to the dentist to have my bad teeth pulled out.
2.The development of thing is depend on the internal causes.
3.All roads lead to Rome.
4.I intended to give you the book,but I forgot to take.
5.I was on the verge of accepting his suggestion.
6.We can't take divorce lightly.
Unit Three
1.Lack of confidence contributes to his failure.
2.In the face of severely diease,he showed great courage.
3.We come to a conclusion that shi is telling the truth.
4.His secreary failed to tell him about the meeting.
5.Learning a language is not only a matter of memorizing words.
6.Once she comes to some decision,on one can hold her back.
7.It is difficult to live up to the standard made by our captain.
8.The scientist refers to this discovery as the most exciting new development in this field.
Unit Four
1.All that I can say is that we are so sorry.
2.In many cases,rules alone will not work.
3.Because of his intelligence and diligence,he's highly likely to succeed.
4.She stared at me,as if she didn't know me.
5.It is reported that three people were injured in the accident yesterday.
6.I was angry the way he treated me.
7.The patient is much the same this morning as he was yesterday.
8.I want to stay at home rather than go out tonight.
Unit Five
1.You will see what I say will come true.
2.The lecture was so boring that half of students fell asleep.
3.Unemployment is tied up with the development of technology.
4.His appearance change so greatly that you may well not recognize him.
5.The history of castle can date back to 14 century.
6.She never did anything for them,whereas they have done anything they could for her.
Unit Six
1.We regard him as one of the most excellent players in this match.
2.The scientist picked those small stones up,and put them into a box carefully.
3.The population of China is almost five times as big as that of America.
4.The reason why grass is green was ever a mystery to the little boy.
5.She was standing by a window,apparently very calm and relaxed.
6.Recently,as a result of sales volume drop down,profits have declined.
7.She wears darkglasses as a protection against the strong light.
8.Through that things,peple will no longer believe him.
Unit Seven
1.If you sing the song for several times,the children can pick up lyrics of it.
2.We try our best to assure the nervous old man that plane taking is safe.
3.The inadequate supply of vitamin A can lead to night blindness.
4.I can use computers,but when it comes to repairing computers,I know nothing.
5.Many a mother try to make their dreams come true on their daughters.
6.The nasty weather discouraged people from attending the parade.
7.I gave him some pills to ease his pain.
8.This job involves going abroad for three months every year.
Unit Eight
1.I think I should piont out how dangerous it is.
2.Their opinions can not affect my decision.
3.When it comes to modern art,few people know more than Tom.
4.When someone asks her,she confirms she will retire.
5.The cough medicine tastes nice,but it doesn't me any good.
6.If we couldn't sell out more goods,we have to cut back on production.
7.The film is all but three hours.
8.I assure you my story is true,lest someone feel strange.
Unit Nine
1.You should arrange things well prior to your setting off.
2.This behavior may result in the manager's being fired.
3.Our products could compete with those of other factories in terms of quality,reliabilty,especially varity.
4.Because of the heavy rain,the performance of the team was affected a lot.
5.I can appreciate the reason why you are against this suggestion.
6.To some extent,she should be responsible for this accident.
7.The thought that life is too comfortable,makes me deeply upset.
8.Women tend to live longer than men.
Unit Ten
1.We can go to the performance at 7o'clock or 8o'clock whichever suits you best.
2.People always think that men are stronger,but most women know the fact is reverse.
3.He was sentenced for five years,but he was released after two years in the jail.
4.You look equally nice on both the clothes,I don't know which one to advice.
5.This candidate has an impressively diverse range of interests and rich experiment.
6.The child suddenlly let go of her hand and run to the opposite side of the road.
7.In a great degree,the result of match depends on the judge's opinions.
8.I'm tired of telling you what I should do all the time.

就是这本书的编者,出了一本《无机化学》书
然后若干年过去了,他觉得有些内容需要修改、删除、增添,
这时他就在原书的基础上,出一个“第二版”,原先那个就叫“第一版”
又过了若干年,又有了“第三版”,“第四版”,……,“第n版”

6单元的
不管怎么样,希望不要关闭问题
追问或者补充问题都可以

这本书没有专门的答案,不过某些题目教材后面有简单的解答.
此外可以参看蓝以中编的高等代数解题指南,课本中难题基本都在上面,
弱弱问一句：楼主是北大的?据我所知,除了北大还没有哪所高校用蓝以中的教材

（1）scanf("%ld"，&profit)
（2）(profit-1)/1000

我应该跟随谁（i要大写）

我给你发

淘宝有代刷，十五左右

把文章发过来,没有书

倾听风吹秋叶，感知秋的心事，秋的静谧，秋的思绪；倾听淙淙小溪，领悟水的絮语，大自然的情怀，人生的豪迈；倾听静静的沉默，更加睿智，更加超然，更加洒脱。微笑着倾听，感觉一切都在微笑；用心来倾听，会发现：这生命，原来如此精彩，这世界，原来是另一个世界。...

留个邮箱啊,是新视野2吧,大一下吧.

已发送,请查收

你可以到找到新编实用英语 综合教程一 第二版的课后习题答案 是高等教育出版社出版的 百度文库也有,http://wenku.baidu.com/view/e18d3a81e53a580216fcfe94.html

那个书后面的DVD上有吧 好像

这个要自己翻吧,一般找不到的

http://wenku.baidu.com/view/842ec91a10a6f524ccbf85c2.html 你打开链接就行了

32,3
64,0
2n,3
2n+1,0
不就是找规律吗

是不是：说出下面各数中”2“表示的含义”?
23中的2表示2个十.
0.52中的2表示2个百分之一.
2/3中的2表示2个1/3.
203.7中的2表示2个百.

课后学习网,看一下吧.
还有什么课后习题答案网、课后答案网等.

高等数学第二版第三册 高等教育出版社 第一章行列式课后习题答案_理学_高等教育_教育专区.高等数学第二版第三册 物理专业类 四川大学数学系高等数学教研室编 ...

东林英语教学网,首页就有,很好找的.

http://www.***.com/Article/48690_3.shtml给你强力推荐一个网站

http://wenku.baidu.com/link?url=tv0DZP47HaU064WYMl15HQZvetCeC-hwXNVY4i9nhvvq7HuJHqDZn1n5TB67312-CafqBwv51jCkqPjkGs6_pphIh3W99ZVRjJygdCykDEC

第一单元A larger and larger part of society is expressing its concern about environmental
protection.Active in their concern,teachers and students hold specific meetings to
discuss environmental protection.Also,city planners take environmental problems into
serious consideration.And,though reducing pollution can be expensive,factories often
take every possible measure to do their part.Many people are concerned and active
because air and water pollution affects everyone and makes it difficult for cities to
survive and businesses to make a profit.
第二单元Computers,just like any new technology,have a negative side.As more and more
computers are used in production lines,many jobs are being taken over by
computer-controlled machines.As a result,many workers are finding themselves jobless.
This constitutes a threat to social security.Another problem is computer crimes.For
example,some people are finding ways to break into the bank computer systems and
transfer large sums of money to their own accounts.There have been many reports like
this.One more negative effect of computers is that they bring about health problems.
Sitting in front of computers all day undoubtedly affects people’s health.Back pain,wrist
pain,failing eyesight,to name only a few.
第三单元Many people place so much emphasis on success that they think any failure is bad.
Failure is never pleasant because it hurts people.But in fact it can make positive
contribution to our life once we learn how to make the best of it.We can learn from a
disastrous party how to give a good one.And we can learn from an ill-chosen first house
what to look for in a second.Even a total failure can give us fresh ideas or a change of
direction.Repeated failures lead to success and prove to be beneficial to us as we
experiment every day to find out the right way of doing things.
第四单元Parents have to save a large amount of money for their children to study abroad.Apart
from the international flight,they have to pay for their daily expense,such as food,
shelter,entertainment,long-distance telephone calls,and clothing.In addition,the
children should have some money ready to cover unexpected expenses.
第五单元There are many problems for mixed marriages.The number one reason is the cultural
differences between the mixed couple,like those in customs and lifestyle.Many people
have prejudice against mixed marriages.They often feel shocked to see people of
different races get married and have doubts about such marriages.What’s more,
children from mixed marriages tend to be looked down upon or even badly treated by
their peers.Mixed marriages face many trials,and as a result,mixed couples have higher
divorce rates than couples of the same race.
估计你们也就考这些吧

FDGB

去网校学习下嘛,

这个要好回答多了.
因为甲乙都是觉得对方比自己更年轻,这个是不会矛盾的,因为两者不在同一参考系

第 三 章 气体分子热运动速率和能量的统计分布律 3-1 设有一群粒子按速率分布如下：粒子数Ni24682速率Vi（m/s）1.002.003.004.005.00 试求(1)平均速率V；（2）方均根速率 （3）最可几速率Vp （1）平均速率：(m/s) (2) 方均根速率(m/s)3-2 计算300K时,氧分子的最可几速率、平均速率和方均根速率. 3-3 计算氧分子的最可几速率,设氧气的温度为100K、1000K和10000K. 代入数据则分别为：T=100K时 T=1000K时 T=10000K时 3-4 某种气体分子在温度T1时的方均根速率等于温度T2时的平均速率,求T2/T1.因 由题意得： ∴T2/T1= 3-5 求0℃时1.0cm3氮气中速率在500m/s到501m/s之间的分子数（在计算中可将dv近似地取为△v=1m/s） 设1.0cm3氮气中分子数为N,速率在500~501m/s之间内的分子数为△N,由麦氏速率分布律：△ N= ∵ Vp2= ,代入上式 △N= 因500到501相差很小,故在该速率区间取分子速率V =500m/s,又 △V=1m/s（=1.24）代入计算得：△N=1.86×10－3N个 3-6 设氮气的温度为300℃,求速率在3000m/s到3010m/s之间的分子数△N1与速率在1500m/s到1510m/s之间的分子数△N2之比. 取分子速率为V1=3000m/s V2=1500m/s, △V1=△V2=10m/s由5题计算过程可得：△V1= △N2= ∴ △N/△N2= 其中VP= m/s =1.375,=0.687 ∴ 解法2：若考虑△V1=△V2=10m/s比较大,可不用近似法,用积分法求△N1,△N2 dN= △N1= △N2= 令Xi= i=1、2、3、4利用16题结果:∴ △N1= （1） △N2= 　　（２）其中VP= 查误差函数表得： erf(x1)=0.9482 erf(x2)=0.9489erf(x3)=0.6687 erf(x4)=0.6722将数字代入（１）、（２）计算,再求得： 3-7 试就下列几种情况,求气体分子数占总分子数的比率：（1） 速率在区间vp～1.0vp1内（2） 速度分量vx在区间vp～1.0vp1内（3） 速度分量vp、vp、vp同时在区间vp～1.0vp1内设气体分子总数为N,在三种情况下的分子数分别为△N1、△N2、△N3（1） 由麦氏速率分布律：△ N= 令v2=1.01vp,vi=vp, ,则 , ,利用16题结果可得；查误差函数表：erf（x1）=0.8427 erf（x2）=0.8468∴ （2） 由麦氏速率分布律：∴ 令 , , ∴ 利用误差函数：（3）令 ,由麦氏速度分布律得： 3-8根据麦克斯韦速率分布函数,计算足够多的点,以dN/dv为纵坐标,v为横坐标,作1摩尔氧气在100K和400K时的分子速率分布曲线. 由麦氏速率分布律得：将π=3.14,N=NA=6.02×1023T=100Km=32×10-3代入上式得到常数：A= ∴ （1）为了避免麻烦和突出分析问题方法,我们只做如下讨论：由麦氏速率分布律我们知道,单位速率区间分布的分子数随速率的变化,必然在最可几速率处取极大值,极大值为：令 则得 又在V=0时,y=0,V→∞时,y→0又 ∵T1=100K＜T2=400K∴ ＜ 由此作出草图3-9根据麦克斯韦速率分布律,求速率倒数的平均值 . 3-10一容器的器壁上开有一直径为0.20mm的小圆孔,容器贮有100℃的水银,容器外被抽成真空,已知水银在此温度下的蒸汽压为0.28mmHg.（1） 求容器内水银蒸汽分子的平均速率.（2） 每小时有多少克水银从小孔逸出?（1） （2）逸出分子数就是与小孔处应相碰的分子数,所以每小时从小孔逸出的分子数为： 其中 是每秒和器壁单位面积碰撞的分子数, 是小孔面积,t=3600s,故 ,代入数据得： N=4.05×1019（个）∴ 3-11如图3-11,一容器被一隔板分成两部分,其中气体的压强,分子数密度分别为p1、n1、p2、n2.两部分气体的温度相同,都等于T.摩尔质量也相同,均为μ.试证明：如隔板上有一面积为A的小孔,则每秒通过小孔的气体质量为：证明：设p1＞p2,通过小孔的分子数相当于和面积为A的器壁碰撞的分子数. 从1跑到2的分子数： 从2跑到1的分子数： 实际通过小孔的分子数：（从1转移到2）因t=1秒, , T1=T2=T∴ 若P2＞P1,则M＜0,表示分子实际是从2向1转移. 3-12 有N个粒子,其速率分布函数为(1)作速率分布曲线.(2)由N和v0求常数C.(3)求粒子的平均速率.（1） 得速率分布曲线如图示（2）∵ ∴ 即 （3） 3-13 N个假想的气体分子,其速率分布如图3-13所示（当v＞v0时,粒子数为零）.（1）由N和V0求a.（2）求速率在1.5V0到2.0V0之间的分子数.（3） 求分子的平均速率. 由图得分子的速率分布函数： ( ) ( ) f(v)= ( )(1) ∵ ∴ (2) 速率在1.5V0到2.0V0之间的分子数 3-14 证明：麦克斯韦速率分布函数可以写作： 其中 证明：∴ 3-15设气体分子的总数为N,试证明速度的x分量大于某一给定值vx的分子数为： （提示：速度的x分量在0到 之间的分子数为 ）证明：由于速度的x分量在区间vx～vx +dvx内的分子数为：故在vx～ 范围内的分子数为： 由题意： 令 利用误差函数得：∴ 3-16 设气体分子的总数为N,试证明速率在0到任一给定值v之间的分子数为：其中 ,vp为最可几速率.[提示： ]证明：令 ,则 ∴ 由提示得： ∴ 3-17 求速度分量vx大于2 vp的分子数占总分子数的比率. 设总分子数N,速度分量vx大于2 vp的分子数由15题结果得：其中 可直接查误差函数表得：erf（2）=0.9952也可由误差函数： erf（z）= 将z=2代入计算得：erf（2）=0.9752∴ 3-18 设气体分子的总数为N,求速率大于某一给定值的分子数,设（1）v=vp（2）v=2vp,具体算出结果来.（1）v=vp时,速率大于vp的分子数：利用16题结果：这里 ∴ （2）v=2vp时, ,则速率大于2vp的分子数为： 3-19 求速率大于任一给定值v的气体分子每秒与单位面积器壁的碰撞次数.由18题结果可得单位体积中速率大于v的分子数为：在垂直x轴向取器壁面积dA,则速率大于v能与dA相碰的分子,其vx仍在0～ 间,由《热学》P30例题,每秒与单位面积器壁碰撞的速率大于v的分子数为： 3-20 在图3-20所示的实验装置中,设铋蒸汽的温度为T=827K,转筒的直径为D=10cm,转速为ω=200πl/s,试求铋原子Bi和Bi2分子的沉积点P′到P点（正对着狭缝s3）的距离s,设铋原子Bi和Bi2分子都以平均速率运动.铋蒸汽通过s3到达P′处的时间为：在此时间里R转过的弧长为：∵ ∴ 代入数据得：3-21 收音机的起飞前机舱中的压力计批示为1.0atm,温度为270C；起飞后压力计指示为0.80atm,温度仍为27 0C,试计算飞机距地面的高度. 根据等温气压公式： P=P0e - 有In = - ∴ H = - In 其中In =In = -0.223,空气的平均分子量u=29.∴H= 0.223× =2.0×103(m)3-22 上升到什么高度处大气压强减为地面的75%?设空气的温度为0 0C. 由题意知： =0.75 故H = -In 代入数据得：H =2.3×103(m)3-23 设地球大气是等温的,温度为t=5.0 0C,海平面上的气压为P0=750mmHg,令测得某山顶的气压P=590mmHg,求山高.已知空气的平均分子量为28.97. H = - In 代入数据得：H=2.0×103(m)3-24 根据麦克斯韦速度分布律,求气体分子速度分量vx的平均值,并由此推出气体分子每一个平动自由度所具有的平动能. （1） x=∫∞ -∞vx2f(vx)dv x =2 ∫∞ 0vx2( ) e - vx2dv x = v -1p∫∞ 0vx2 e - vx2dv x查《热学》附录3-1表得： x= Vp-1( )3/2= 同理可得： y= x= (2)分子总的平动能： 2= 2= = m x= 同理得： = = 可见,气体分子的平均动能按自由度均分,都等于 KT.3-25 令ε= mv2表示气体分子的平动能,试根据麦克斯韦速率分布律证明,平动能在区间ε～ε+dε内的分子数占总分子数的比率为：f(ε)dε= (KT) -3/2ε e-ε/KTdε 根据上式求分子平动能ε的最可几值. 证明：（1） ∵ f(v)dv =4∏( )3/2e v2v2dv = (KT) -3/2( v2)1/2e-mv2/2KTd( ) ∵ ε= mv2 故上式可写作： F(ε)dε= (KT) -3/2ε e -ε/KTdε(2) 求ε最可几值即f(ε)为极大值时对应的ε值. = (KT) -3/2 [ε e -ε/KT(- )+e- ε- ] = (KT) -3/2e - ( ε- -ε /KT)=0 ∴ ε- -ε =0 得: εp = ε = 3-26 温度为27 0C时,一摩尔氧气具有多少平动动能?多少转动动能? 氧气为双原子气体,在T=300K下有三个平动自由度,两个转动自由度. 由能均分定理得： ε= RT = ×8.31×300 = 3.74×103 (J) = RT = 8.31×300 = 2.49×103(J) 3-27 在室温300K下,一摩托车尔氢和一摩尔氮的内能各是多少?一克氢和一克氮的内能各是多少? U氢= RT =6.23×103(J) U氮= RT =6.23×103(J) 可见,一摩气体内能只与其自由度（这里t=3,r=2,s=0）和温度有关. 一克氧和一克氮的内能： U= ∴U氢= = = 3.12×103(J) U氮= = = 2.23×103(J)3-28 求常温下质量为M=3.00g 的水蒸气与M=3.00g的氢气的混合气体的定容比热 设Cv1 ‘、Cv2 ‘分别为水蒸气和氢气的定容比热,Cv1 、Cv2分别为水蒸气和氢气的定容摩尔热容量.在常温下可忽略振动自由度,则有： Cv1= R =3R ∴Cv1’= = Cv2= R =2.5R Cv2’= = Cv = = = ( + ) = 5.9 (J/gK)3-29 气体分子的质量可以由定容比热算出来,试推导由定容比热计算分子质量的公式.设氩的定容比热Cv = 75CalKg-1K-1,求氩原子的质量和氩的原子量. （1）一摩尔物质定容热容量为：Cv =ucv,对理想气体来说： Cv = (t+r+2s)R 分子质量m = = = (t+r+2s)R = (t+r+2s) (Cv=75cal/kgk) (2) 氩是单原子分子,故Cv = R =3(Cal/molK) 故氩的原子量u= = 4.0×10-2(Kg/mol)

The Selfish Giant (by Oscar Wilde)
The Sheik's White Donkey
I Met a Bushman
Never Too Old to Live Your Dream (by Dan Clark)
Your Legacey (by Tony D'Angelo)
The Unicorn in the Garden (by James Thurber)
The New Assistant
The Killers (by Ernest Hemingway)
The Painting of Ngley Hall(by M.R.James)
The Green Door (by O.Henry)
The Yellow Shirt (by Darline Anderson)
The Open Window (by H.H.Muntro/Saki)
自私的巨人（奥斯卡王尔德）
教长的白驴
我遇到一位布什曼
从来没有太老了,住你的梦（作者Dan克拉克）
您Legacey（托尼安吉洛）
独角兽（詹姆斯瑟伯的花园）
新助理
杀手（由海明威）
这幅画（由M.河詹姆斯Ngley厅）
绿门（由欧亨利）
黄衬衫（由Darline安德森）
在打开的窗口（由H.H.Muntro /扎基）

已经发到你邮箱了^-^

细胞生物学名词解释1.x05细胞（cell）是组成包括人类在内的所有生物体的基本单位,这一基本单位的含义即包括结构上的,也包括功能上的.2.x05细胞生物学（cell biology）是在细胞水平上研究生物体的生长、运动、遗传、变异、分化、衰老、死亡等生命现象的学科.3.x05医学细胞生物学（medical cell biology）以人体或医学为对象的细胞生物学研究或学科.4.x05原核细胞（prokaryotic cell）是组成原核生物的细胞,这类细胞主要特征是细胞内没有分化为以膜为基础的具有专门结构与功能的细胞器和细胞核膜,且遗传信息量小,因此进化地位较低.5.x05真核细胞（eukaryotic cell）指含有真核（被核膜包围的核）的细胞,主要特征是有细胞膜、发达的内膜系统和细胞骨架体系.6.x05生物大分子（biological macromolecules）也称多聚体,由许多小分子单体通过共价键连接而成,相对分子质量比较大,包括蛋白质、核酸和多糖等.7.x05多肽链（polypeptide chain）多个氨基酸通过肽键组成的肽称为多肽链.8.x05细胞蛋白质组（proteome）将细胞内基因活动和表达后所产生的全部蛋白质作为一个整体,研究在个体发育的不同阶段,在正常或异常情况下,某种细胞内所有蛋白质的种类、数量、结构和功能状态,从而阐明基因的功能.9.x05拟核（nucleoid）原核细胞没有核膜包被的细胞核,也没有核仁,DNA位于细胞中央的核区就称为拟核.10.x05质粒（plasmid）很多细菌除了基因组DNA外,还有一些小的双链环形DNA分子,称为质粒.………………
详细资料请参考：on

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A Letter To My Parents
Dear Mom and Dad,
I love you! I love you so much! I love you with all my heart! This letter to you is to tell you my true feelings from the bottom of my heart.
Thank you so much for bringing up! Thank you so much for raising me. I know how hard you’ve worked during the past years. I can image how many difficulties and obstacles you’ve conquered. I can imagine all the problems you have faced and all the sweat and tears you have shed to make my life better. I can fully understand what a huge responsibility it is to raise a child. You’ve been very patient with me. You’ve encouraged me and you’ve helped me. You’ve tried your hardest to give me the best things in life. You’ve made a lot of sacrifices and many difficult choices. I also know that you have great expectations of me. You want me to be very successful and happy. You want me to be the best person I can be. You want me to do great things with my life. You want me to make the world a better place. I know you have so many so many hopes and dreams for my future.
Today I want to tell you something extremely important.
Today I want to tell you that you don't need to worry about me any more. I'm grown up! I will be responsible for my life and for my future. I will study very hard. I will exercise everyday to keep fit. I will read English every morning and every night. I will make the best use of every spare minute. I will be happy, confident, positive and energetic everyday! I will develop good habits and use them to constantly improve myself. I will never do anything that would harm my body or my mind. I will never do anything that would make you feel disappointed or ashamed. I will learn as much as I can and become smarter and stronger every day. I have learned by watching you that the best way to reach my goals is to work hard and never give up. You’re my best role models. You set a great example for me.
I have so many great dreams. I know that realizing these dreams will take a lot of time and effort. But don't worry about me. I have strong confidence in myself. I know if I keep trying, keep working hard and keep dreaming, I will definitely realize all my dreams. I will be somebody special. But I will not only care about myself. I will contribute to my school, my hometown and my country. I will contribute to society. I will use all my abilities and talents to help my family and my country have a glorious future. I will make a difference in this world.
Dear Mom and Dad, you’ll be proud of me! You will see great results from all your hard work and sacrifice. Thank you very much for your continued support! Thank you very much for your patience, love and understanding. I love you! I appreciate you! I’m very proud of you!
Exercise every day to keep healthy! Enjoy life every day and stay happy! My only hope for you is you both to enjoy continued health and happiness. You brought me into this word to share your life. I will do my best to make sure each day of it is filled with joy and pride.
Mom and Dad, you are the best parents in the world! I don’t know what I would have done without you.
All My Everlasting Love,
Your Son /Daughter
给爸爸妈妈的一封信
亲爱的爸爸妈妈：
我爱你们!我是多么的爱你们啊!我全心全意去爱你们!给你们写这封信是想告诉你们我内心深处的真实感受.
感谢你们抚养我长大,感激你们的哺育之恩,我清楚地在过去的这么多年来,你们多么辛苦的工作.我能想象你们克服了多少困难与艰辛,也能想象这些年来你们所面对的问题,还有你们为我的生活变得更加美好而洒下的热泪与汗水!我能深刻理解,抚养一个小孩是多么巨大的责任.你们对我非常耐心.你们一直在鼓励与帮助我.你们尽最大的努力为我提供生活中最好的东西.你们做出了许许多多的牺牲,也做过很多困难的抉择.我也知道你们对我有殷勤的期望.你们希望我成功并快乐,你们希望我成为最好的人,你们希望我能用生命去做伟大的事情,你们想我能将这个世界变得更加美好.我知道你们对我的未来有许多希望和梦想.
今天我要告诉你们一件极其重要的事.
今天我想跟你们说不需要再为我担心了.我已经长大成人.我会为我的人生和未来负责的.我会用功读书.我会每天锻炼身体,保持良好心态.每个清晨与夜晚我都会读英语.我会充分利用闲暇的每一分钟.我每天都会快乐、自信、积极向上并且精力充沛!我会养成良好的习惯,并且利用它们不断完善自己.我不会做任何有伤身心的事情.我不会做任何让你们失望或感到羞耻的事情.我会尽量的多学习,每天变得更聪明、更强壮一点.在你们身上我看到要达成目标的最好的办法是刻苦,并且永不放弃.你们是我最好的人生楷模,为我树立了一好榜样.
我有许多伟大的梦想.我知道要实现这些梦想要花很多时间与精力.不过不要为我担心,因为我对自己有强烈的自信心.我知道只要我一直坚持不懈,敢想敢拼,一定能实现我所有的梦想.我会成为不平凡的人,不过我不会只关心自己,我会为学校、为家乡、为祖国做出贡献.我会回报社会.我将用自己的聪明才智让我们的家及我们的祖国拥有一个光辉的未来.我会在这个世上作出点成就来.
亲爱的爸爸妈妈,你们将会为我自豪的.你们将会看你们所有的辛苦与牺牲都是有好的结果的.非常感谢你们一直以来的支持!感谢你们对我付出的耐心、关爱与理解.我爱你们!我感激你们!我为你们而自豪.
每天坚持锻炼保持身体健康.享受生活,快乐每一天!对你们的唯一希望是希望你们能保持健康与幸福.是你们把我带来这个世界上,来分享你们的生活.我会尽力保证每一天你们的生活都是充满快乐与骄傲.爸爸妈妈,你们是世界上最好的父母!真不知道如果没有你们,我会怎么样.
永远爱你们的女儿、儿子

这道题不存在算法,要数,问的是有几条与V相连接的线段不是这个图形的边,
除V外,此图还有11个点,故共11条线段,其中有3条是图的边,所以答案是8.

抱歉,我不是学的这一版,所以...对不起啦

抬高处水深 h = 2-0.5-0.15 = 1.35 m 取上游到抬高处某断面的水体作为分析对象,作用其上的力作用有：
上游水体对该水体上游断面的作用力:
P1=0.5pgbH^2=0.5*1*9.8*2.7*2^2 =52.92 kN
下游水体对该水体下游断面的作用力:
P2=0.5pgbh^2=0.5*1*9.8*2.7*1.35^2=24.11 kN
由连续方程（2.7*2）V1=（2.7*1.35）V2 得 V2 =1.48V1 （1）
列上下游断面能量方程：2+V1^2/(2*9.8)=2-0.15+V2^2/(2*9.8) （2）
（1）代入（2）得 V1=2.47 m/s V2=3.66 m/s
流量 Q=V1*A1=2.47*（2.7*2）=13.34m^3/s
设抬高处对水体的向上游的作用力为R.列动量方程（以流向为正方向）：
P1-P2-R=pQ（V2-V1）代入数据得
52.92-24.11-R=1*13.34*（3.66-2.47） 解得 R = 12.94 kN
答：渠道的流量为13.34立方米/秒；水流对底坎的冲力为12.94kN,水平指向下游.

此题导体接地,外表面无电荷,合电场强度才为0.此时,内壁电荷与q等量反性,在导体内部形成电场,电力线止于内壁,导体外E=0.

1.If you could sing this song for times,the children would pick up the words.
2.We all try our best to assure the old man that it's safe to take an airplane.
3.Inadequate of Vitamin A would lead to night blindness.
4.I can use the computer,but when it comes to repair it,I know nothing about it.
5.Many a mother tries to realize her dreams in her daughter.
6.The bad weather discourages people from demon stration.
7.I give him some medicines to ease his pain.
8.This job was involved in going aboard for three months every year.

你把句子写出来

Punctuality and Keeping Promise
(para.1) In social activities it isalways emphasized to be punctual,to have a strong conception of time.If youfail to keep your promise or do not come on time and thus keep your hostwaiting,that is very impolite.It’s hard to imagine what will happen if thereis such an activity as a banquet,interview,or meeting,yet all people concerneddo not come on time.If you are asked to meet a foreign guest at the airport orat the railway station and you go so late that the guest has come before youarrive,how anxious and embarrassed he will be when he ,as a stranger to theplace,sees no person meeting him!The same is true with the activity of seeingoff a foreign guest.If you arrive so late at the airport or railway station tofind the guest has gone already,what’s the use of your going there?
(para.2) So,as a host,whenever there is an activity,you should come tothe place ahead of schedule so as to wait for the guests to come.Don’t let theguests wait for you.It’s very impolite.Those who are to help entertain the guests should also come earlier than the guests.But for a guest,at what timeis it proper to come?You should be punctual.That is,neither too early,nor too late.If it is tooearly,the host may not get the things ready.If it is too late,you may keepthe host waiting.Anyone,guest or host,who is really late for a socialactivity,should apologize to those who have already been there.
(para.3) After making an appointment,generally,don’t change it asthat is impolite.If you do have to change,you should inform the person bytelephone or with a written note as soon as possible,so that he or she canmake a rearrangement.Sometimes,an appointment has been already made,butsomething unexpected happens and you find no time to inform the personconcerned.In this case,you shouldmake an apology to the person afterwards.

这有三册了.