（特急）物理题如图：将两条磁性很强且完全相同的磁铁分别固定在质量相等的小车上,水平面光滑,开始时甲车速度为3m/s,乙车

从中选择你需要的好了：
《2012》英文观后感841篇：
《后天》英文观后感1083篇：
《拆弹专家》是不是史泰龙的 The Specialist,英文观后感87篇：

HAC + H2O == AC^- + H3O^+
NH3.H2O == NH4^+ + OH^-

此题应该选D
A：FOB班轮条件(FOB Liner Terms)指装货费按班轮办法处理,即卖方不负担装货费,但并不是指FOB成交的货物一定要用班轮装运,至于装货费由谁承担,取决于买方租船时采用的租船条件.
B：FOB吊钩下交货(FOB Under Tackle)卖方仅将货物交到买方指定船舶的吊钩所及之处,以后的装货费用,卖方不予负担.
C：FOB理舱(FOB Stowed)为了使船上装载的货物放置妥善和分布合理,货物装船后需要 进行垫隔和整理,即为理舱,卖方需承担理舱费.
D：FOB平舱(FOB Trimmed) 货物装船后,为了保持船舶承受的压力均衡和航行安全,对成堆装入船舱的散货,需要进行调动和平整,即为平舱,卖方需承担此项费用.

是叠音词.
叠音词：是由两个相同的音节重叠而成的双音词.例如：
猩猩、馍馍、纷纷、潺潺、孜孜

黄河之水天上来——源远流长
此曲只应天上有——不同凡响
说尽心中无限事——畅所欲言
白云深处有人家——空中楼阁
相逢何必曾相识——一见如故
卷我屋上三层茅——风吹草动
问君能有几多愁——对答如流
两个黄鹂鸣翠柳——不知所云

1.以B点为原点,BC为X轴正方向建立直角坐标系,设三角形ABC重心P（x,y),A(xA,yA)
则1/2*|yA|*4=6,所以|yA|=3,yA=3或yA=-3 所以A（x,3)或A（x,-3)
由于P为重心,则向量BP=1/2向量PA,当yA=3时,即(x,y)=1/2(3x-x,3-y) 得y=1
；当yA=-3时,(x,y)=1/2(3x-x,-3-y) 得y=-1 所以重心轨迹方程为y=正负1
2.简单的 图画下,对照着做就好了 就是解步骤多点,自己写吧

（x／y）的三次方÷（3x／y）的平方×6x／y
=x³/y³/(9x²/y²)*(6x/y)
=(x/9y)(6x/y)
=2x²/3y²
=(2/3)(3/2)²
=3/2

平行四边形：两边平行且长度相等!
三角形：两边之和大于第三边
关系：任意平行四边形沿任一条对角线分此平行四边形为两个三角形且两个三角形完全相等

外圆半径R,内圆半径r
r/R=350/530
r+1108=R
R(1-35/53)=1180
R*18/53=1180
R=3474.44mm

名言：害怕危险的心理本身就比危险可怕一万倍.
面对危险,关键是看你怎样面对,如果你害怕危险,悲观退缩,那么你一定会失败,如果你不怕危险,勇往直前,那么你将有可能成功.

将25g甲物质.5g乙物质.10g丙物质混合加热发生化学反应:反应前总质量为40g
反应后的混合物中含有10g甲,21g丙,还有一新物质丁：根据质量守恒原理知,丁的质量为：40-10-21=9 g
甲.乙.丙.丁的相对分子质量分别为30.20.44.18,他们参加反应的分子数之比为：
[（25-10)/30]:[(5-0)/20]:[(21-10)/44]:[9/18]
=0.5:0.25:0.25:0.5
=2:1:1:2
它们之间所发生化学反应的方程式是 2A+B=C+2D
所以选 B

Sure,I think men will usually recall their days playing video games or fighting with their fellow parterners,while women will usually recall their days enjoying flowers or helping others out of their troubles.
haha

The ministry of education is always your gas station.

A) the development of science and technology
Late of the 20th century, science and technology are developing rapidly, there are many new things, new vocabulary is applied and bore, for example: sociolingujstics (social linguistics, cybernetics (cybernetics), etc. The new findings, science and technology, the new theory, new inventions are needed, so that generates a lot of new structure, at the same time, some old words are given meaning, for example: the ecology (ecology), ecoactivlst appeared after ecocatastrophe), (ecology activists (about) and ecocide (extinction) and ecological ecocrisis (ecological crisis), etc. To protect the ecological environment is becoming more and more important, so many goods are written in the advertisement eco - cut (not ecological balance), and works hard - cut (won't) like the pollution of the word. With the invention of the newly created appear ceaselessly, Laser comp (computer), Laser printing fax (fax cable), CAM - corder (hand-held cameras), flat LCD television (-- representation of ultra-thin television), the coffee (instant coffee), a new word appears in people's lives.
(2) the changes of political economy
The social, political, and economic situation change multiterminal, reflected in all aspects of vocabulary. Especially political aspects of words emerge in endlessly. In 1972, American history famous watergate watergate, appearing in English, also have originally gate simple meaning "door" become a form, said the watergate scandal "similar". In 1988, the bush presidency, involving sale to Iran of horses, this scandal is called Irangate (Iran), to the Chinese, Chinese door with the political scandal ","
The new meanings. American young people for generations, the label from the 1960s Hippies (Hippies) until the 1970s, the Yippies (yuppie), the first world war ii has lost the generation (the generation), the second world war the beat generation (collapse generation). The world situation unrest, great historical events will be done a new English words. Example: shuttlediplomacy (shuttle diplomacy), mini - summit meeting), small (senior), psywar confrontation (against), the war's psychological (trade (), etc. The new vocabulary growing, and promote the development of English vocabulary.(我跟机器一起的)

（1）他忽然想起老牛临死时说的话,这正是“特急事”.
（2）夫妻俩痛哭了一场,老牛的尸骨被他们埋在草房后边的山坡上.

可能想出的有 以下方程
2C+SiO2=高温Si+2CO↑
C + ==高温 CO + H2 ↑
2F2+ 2H2O=4HF+O2↑

老师就像春天的蚕一样无私,为人类吐丝为衣；还像一根很伟大的蜡烛一样燃烧自己给人类带来光明,自己却默默落泪…………老师很伟大,教我们读书做人,如是所言…………希望对你有帮助……

128为2的7次方,左边就可以写成2的7x次方了,而右边可以写成2的14次方.故x等于2了!

Sure,the world economy is developing,and today is more developed than in the past.People may satisfied with material things in the past like food and clothes,but now people are more likely to persue a life of spiritual satisfaction.

面对隐蔽在废弃工厂的敌人,战士们一筹莫展.
正当战士们商量好对策准备昂首挺胸的包抄敌人时,敌人狡猾的撤退了.
战士们像霜打的茄子一样,都耷拉着脑袋,说不出话来.

I can pick up you tomorrow because I happen to have a meeting there.

证明：可设这4个连续整数依次为n、n+1、n+2、n+3,则有
n(n+1)(n+2)(n+3)+1
=n(n+3)(n+1)(n+2)+1
=(n^2+3n)(n^2+3n+2)+1
=(n^2+3n)^2+2(n^2+3n)+1
=(n^2+3n+1)^2
所以说4个连续整数的积与1的和是一个完全平方数.

We have got beautiful memories during the three years we spent with each othe

设AC中点为D,连BD并延长至E,使BD=DE,所以AE=7=BC
用余弦定理可求得cos角ABC=11/21
角BAE余弦值为-11/21
再用余弦定理的逆定理求BE
BD=BE/2

读书的好处：
在这个世界上,书像天上的繁星,数不胜数!我就爱这“满天的繁星”!
好书籍是全世界的营养品.伟大的诗人杜甫说：“读书破万卷,下笔如有神.”这些关于读书的名言时刻激励着我.由于爸爸妈妈小时候读书不如愿,所以,他们就把希望寄托在我的身上了,决心好好培养我读书.白天,爸爸妈妈一同出去务农,晚上回来后,不管有多疲劳,都会拿出旧书或旧报纸在灯下夜读.爸爸和妈妈读书的兴趣感染了我.所以,我也不时会拿出一本课外书来阅读,慢慢地我对书产生了兴趣.现在,我已经时时刻刻都离不开书了.妈妈为了让我学到更多的知识,专门给我买了四册少儿百科全书.要知道这买书的钱,还是妈妈从牙缝里挤出的钱买的,如果不买这四册书的话,妈妈还可以买 好几件衣服呢.所以,我决心好好品尝这“美味佳肴”.当我大概了解了这四册书的内容后,我感受到：一本好书,蕴涵着许多丰富的知识和美好的情感.阅读一本好书,就是要跨越时间和空间,同睿智和高尚的人对话,这是多么美妙的事情啊!所以,我一定要好好珍惜.为了看书,我还闹了一个笑话.有一次,妈妈叫我去买盐,我走的时候还拿了一本书,在路上,我看入迷了,当我正看得津津有味时,突然,汽车的喇叭生把我吓了一跳,书都掉到底下,我一看,原来,我已经在过马路了,可是,我却没看左右的车辆,所以,我差点被撞了.司机骂了我,我只当没这一回事儿,我继续看书了.回到家,妈妈问我买的盐哪去了,我才发现,自己看书忘了买盐了.我和妈妈都哭笑不得.古今中外有成就的人,都喜欢阅读,并善于从书中西吸取营养,从而走上了成功之路,让我们养成阅读的好习惯,一生都与好书相伴吧!
读书真美丽

圆溜溜

北师大版高中英语模块六单词表（English）Unit 16 Unit 17 Unit 18Warm-upbiographyfantasyhorrorabandoncome into viewknock sb.overvictimonce upon a time princesscriterianovelistLesson 1volcanic eruptionpre...

萌未成年,很高兴为你回答.
王华制作的小船十分【精致】.
【精美】的工艺品吸引了许多观众.
我国这一园林艺术瑰宝、建筑艺术的【精品】,就这样化成了一片灰烬.
那台【精密】的仪器十分贵重.
做作业时计算要【精心、精细】,不能粗心大意.
希望我的回答可以给你一些启发.

f(x)=x^e^x
f(-x)=-xe^(-x)=-x/e^x
f(-x)≠f(x)
f(x))≠-f(x)
所以y=xe^x即非偶函数,也非奇函数

(An/An-1)=2.An=2的n-1次方.Bn=log2An=log以2为底数2的n-1次方=n-1倍的log22=n-1.为等差数列.Sn=n(a1+an)/2=n(n-1)/2

Yes,I think so.Childhood is the most innocent and sweet period,when you get older with time goes by,your experiences will become more and more complicated,no more pure than before.You will cherish the childhood experiences during your whole life,and memorize it forever in your brain.

学了太多年了,基本忘记了.
生成焓,应该是化学变化过程中能量变化值,不等于自身能量.键能和焓相关,对于一个化学反应来说,反应前后键能变化,应该和生成焓绝对值一致.

I used to be happy,but what's wrong with me today?
汗你

The elder person has experienced a lot and had a lot of hard time.comparing with those,the childhood is more less hardness.so they feel that their childhood was the happiest time of their lives

答案是 x1=p x2=-p+m+2
x^2-（2+m）x+2m=p^2-（2+m）p+2m
x^2-（2+m）x-p^2+（2+m）p=0
（x-p）（x-2-m+p）=0

C坐标(-0.5,-0.5)
M坐标(-0.5+0.5cosa,-0.5+0.5sina)
MB2=(-0.5+0.5cosa)2+(0.5+0.5sina)2
MA2=(0.5+0.5cosa)2+(-0.5+0.5sina)2
MO2=(-0.5+0.5cosa)2+(-0.5+0.5sina)2
把式子代进取就可以解了（记得分母有理化）
答案根号2

6ab-9a+10b=303,首先排除ab均是偶数的情况（否则偶偶和不可能为奇）,然后确定a奇b偶（反之等式不成立）
然后原等式两边除以3得2ab-3a+b*10/3=101.因为ab都是整数,可以确定b可以被3整除.
既然如此,b是能被3整除的偶数,故b是6的倍数.设b=6k（k为整数）,则
12ak-3a+20k=101.
k=0,a非整数；
k=1,a=9;
k=2、3、4等情况,a均无整数解.
所以k=1,b=6,a=9.a+b=15.

开头营造了萧瑟、冷落之感,是主人公凄婉感情的流露.

1）延长AD到F,使DE=DF,连接CF,则 ∠CFE = ∠CDE.CF=AC
因为AB =AD ,所以 ∠ABD=∠ADB
又因为 ∠ADB = ∠CDE ,所以 ∠CFE=∠ADB
因为AD为∠BAC的角平分线,所以 ∠BAD=∠DAC
所以 △ABD相似于△AFC
所以 ∠ABD= ∠ACF
即 ∠AFC=∠ACF
所以 AB = AC
即 AD+2DE = AC
2)延长DE至点F,使AE =EF,连接CF ,则 ∠CFE = ∠CAE.CF=AC
因为AB =AD ,所以 ∠ABD=∠ADB
又因为 ∠DAG = ∠CAE ,所以 ∠CFE=∠DAG
因为AD为∠BAC的角平分线,所以 ∠BAD=∠DAG
所以 ∠CFE = ∠BAD.
所以 △ABD相似于△CDF
则 ∠FCD=∠ABD
所以∠FCD= ∠FDC
即 CF=FD=AD+2AE=AC
3)
AD+AE=2AC

若a-4>0 |a-4|=a-4
所以 |a-4|+4-a =0
若a-4

∫[0,a] [f(x)+f(2a-x)]dx
=∫[0,a] f(x)dx+∫[0,a] f(2a-x)dx
令t=2a-x,x=2a-t,dx=-dt,
x=0时,t=2a,x-a时,t=a
因此上式变为
=∫[0,a] f(x)dx+∫[0,a] f(2a-x)dx
=∫[0,a] f(x)dx-∫[2a,a] f(t)dt
=∫[0,a] f(x)dx+∫[a,2a] f(t)dt
=∫[0,2a] f(x)dx
∫ [0,π[(xsinx) / (1+cos^2 x）］dx
=∫[0,π/2] [(xsinx) / (1+cos^2 x）］dx+∫[π/2,π] [(π-x)sin(π-x) / (1+cos^2 (π-x）］dx
∫[(xsinx) / (1+cos^2 x）］dx
=-∫[(x) / (1+cos^2 x）］dcosx
=-xarctan

1、百分之一 43个
2、9.35 9.4
3、100
4、0.24

比较唐代古文运动与北宋诗文革新在散文改革方面的同异.
同：都是文学革新运动.
异：古文运动兼有思想运动和社会运动的性质；而北宋诗文革新运动是适应政治斗争需要而起的.
参考：北宋诗文革新：中国北宋继唐代古文运动而起的文学革新运动.主要反对以西昆体为代表的浮靡文风,主张对诗、文进行革新.北宋初年,面对土地兼并加剧,各种社会矛盾日益暴露,政治斗争日趋尖锐,一些开明的中下层士大夫文人主张革除社会弊病,要求文学反映现实,而当时风靡文坛的西昆体根本无法担当这样的历史使命.于是推崇韩愈、白居易,反西昆成为政治改革派们在文学上的反映.
参考：唐宋古文运动是指唐代中叶及北宋时期以提倡古文、反对骈文为特点的文体改革运动.因同时涉及文 学的思想内容,所以兼有思想运动和社会运动的性质. “古文”这一概念由韩愈最先提出. 他把六朝以来讲求声律及辞藻、 排偶的骈文视为俗下文字,认为自己的散文继承了先秦两汉文章的传统,所以称“古文”.韩愈提倡古文,目的在于恢复古代的儒学道统,将改革文风与复兴儒学变为相辅相成的运动.在提倡古文时,进一步强调要以文明道.除唐代的韩愈、 柳宗元外,宋代的欧阳修、王安石、曾巩、苏洵、苏轼、苏辙等人也是其中的代表性人物.

（20-13）×6+（22-20）×2=46元
答：付停车费46元
男生人数=6/7÷（8/9-6/7）=27人
女生=27×8/9=24人
答：男女各27人 24人

http://www.***.com.cn/ArticlePart.aspx?titleid=yxzh20080905

-1/2
-2分之根号3
-cos(2π/5)
-1/2
-tan(π/5)
-根号3

1.甲的速度 是X 乙的是y
2x+2y=80
2x-2y=2.4 x=20.6
2.

I think there are three ways to improve them,one is the mind-set,it is not only require young people have to be calm,consider the environement of the time,but also the attitute on helping,help does not mean payback; the second is the method,how to help,be avoid of aimless and impulsion.

Are happy to help others,others have been warm,they receive a happy.