你稍微运动运动就会恢复健康 用英语怎么说

用力矩算
G*r=F*h
4000*（60/2）=F*80
F=1500N
C是在圆柱顶上吧?

这个是两个函数的乘积,一个函数是x^2,另一个是sinx.用函数乘积的求导公式,先对第一个函数求导,结果是2x,再乘以第二个函数,结果是2x*sinx,再加上对第二个函数求导再乘以第一个函数,得到2x*sinx+x^2*cosx
附：(f*g)' = f' * g + g' * f

设A（x,y）在根号x+根号y=1上,A到原点的距离为√（x^2+y^2)
重要不等式(a+b)/2≤√[(a^2+b^2)/2]
√x+√y≤√2√(x+y)≤√2*√(√2*√(x^2+y^2))
令√（x^2+y^2)=t
1≤√2√(x+y)≤√2*√(√2*t)
(√2*t)≥1/2
t≥√2/4
两次取等号都是在x=y时取得,所以曲线根号x+根号y=1的点到原点的距离最小值为√2/4

slightly ,slowly,tide, a bit of,也许您找的是subtle.
希望我的回答,让您满意!

1 The stadium ,__an area of 22,000m,is very grand
A covers B coverd C which covering D covering

2 __I told you just now was __had been written in the letter
A what,what B that that C whether that D If who
3 There __no further business ,the meeting was over .
A was B were C is D being
4 I __to help him with the work ,but he refused politely .
A said B wated C offerde D suggested
5--I wonder .Why he is late .
--He __the early bus .
A could miss B may have missed C can have missed D might miss
有空再写吧

恩,月球引力此时较大,但相对于地球对你的引力,还是小的可以忽略,但从理论上讲还是减少了

Park
There is a park near my home.There are a lot of beautiful trees,flowers and birds in the park.So many people go to the park to enjoy their weekends.They like walking or having a picnic in the park.But I like flying a kite with my sisiter there.
我家附近有一个公园.哪里有很多美丽的树、花和小鸟.所以很多人都喜欢到那里去度周末.他们喜欢在公园里散步或是野餐.但是我喜欢和我姐姐在那里放风筝.
Bedroom
I have a small bedroom.There are only a small bed,a small desk and a small chair in the room.And there is a beautiful doll on my blue bed.Everyday I do my homework,read books and play games with the doll in my bedroom.It is small,but it gives me much happiness.
我有一间小小的卧室.那里有一张小小的床、小小桌子和一把小小的椅子.而且还有一个漂亮的娃娃在我那张蓝色的小床上.我每天都在房间里写作业,看书和与我的娃娃玩.虽然房间很小,但是他给了我很多欢乐.
My father
My father is a tall and handsome man.He is a policeman.Everyday he comes back home very late,because he must help the others.He doesn't have time to examine my homework and take me to the park.But I like my father,because he is a good policeman.
我的爸爸是一个高大帅气的男人.他是一个警察.他每天都很晚才回家,因为他要帮助其他的人.他没有时间给我检查作业和带我去公园.但是我仍然很喜欢我的爸爸,因为他是一个好警察.
Yesterday it was Fathers'Day.I didn't go to school,I went shopping with my friend.I used my pocket money to bought a nice gift for my father .As soon as I got home,I cleaned the house and did some housework.When my father came back home,he saw the house was clean.He felt very happy.
昨天是父亲节,我没有去上学,我和我的朋友们一起去购物,我用我的零花钱给我爸爸买了一份漂亮的礼物,我一回家,我就打扫房间和做家务.当我爸爸回到家的时候,他看见屋子很干净,他感到非常开心.
on June 15,Sunday,I went to play football with my friends in the afternoon.We went to the playground where we usually went.We were playing happily.Suddenly,I fell over and my leg hurt.My best friend,Li Hua,took me to a hospital.The doctor looked over my leg for a while.At the end,there aren't any big problems on my leg and my friends went home with me in case i would fall down again.
6月15号,星期天下午,我和我的朋友们去踢足球,我们去我们去过的操场玩,我们玩得很开心,突然,我摔倒了,脚也受伤了,我最好的朋友李华,送我去医院,医生看了我的脚一会儿,最后,医生说我脚没有什么大问题,然后我的朋友就送我回家,

.
纯手写
If I had superpowers
We must had watched US science fiction movies whether recent or before.You must had been amazed at the superpower of the superman or spider-man and I also want that superpower .It is a world ,you know,with fierce competition and unfair things,so if I had superpower I'd do many things to help those kind of people on the margins of society.Those who live without safeguard need our help and concern.I would reduce the pollution of environment and create a new way to communicate between people so that we could understand others better.I also would help poor families to live a good life ,a life without hunger but honour and dignity.You would see that if I had superpower I could do so many things I used wanted to do.I do believe in superpower that it can change so many unfair things and make our world bette

1 蕲蛇,即蕲州产的白花蛇.这种药有医治风痹、惊搐、癣癞等功用.李时珍早就研究它.但开始,只从蛇贩子那里观察.内行人提醒他,那是从江南兴国州山里捕来的,不是真的蕲蛇.那么真正蕲蛇的样子又是怎么样的呢?他请教一位捕蛇的人.那人告诉他,蕲蛇牙尖有剧毒.人被咬伤,要立即截肢,否则就中毒死亡.在治疗上述诸病有特效,因之非常贵重.州官逼着群众冒着生命危险去捉,以便向皇帝进贡.蕲州那么大,其实只有城北龙峰山上才有真正的蕲蛇.李时珍追根究底,要亲眼观察蕲蛇,于是请捕蛇人带他上了龙峰山上.那里有个狻猊洞,洞周围怪石嶙峋,灌木丛生.缠绕在灌木上的石南藤,举目皆是.蕲蛇喜欢吃石南藤的花叶,所以生活在这一带.李时珍置危险于度外,到处寻找.在捕蛇人的帮助下,终于亲眼看见了蕲蛇,并看到了捕蛇、制蛇的全过程.由于这样深入实际调查过,后来他在《本草纲目》写到白花蛇时,就得心应手,说得简明准确.说蕲蛇的形态是：“龙头虎口,黑质白花、胁有二十四个方胜文,腹有念珠斑,口有四长牙,尾上有一佛指甲,长一二分,肠形如连珠”；说蕲蛇的捕捉和制作过程是：“多在石南藤上食其花叶,人以此寻获.先撒沙土一把,则蟠而不动,以叉取之.用绳悬起,刀破腹以去肠物,则反尾洗涤其腹,盖护创尔,乃以竹支定,屈曲盘起,扎缚炕干.”同时,也搞清了蕲蛇与外地白花蛇的不同地方：“出蕲地者,虽干枯而眼光不陷,他处者则否矣.”这样清楚地叙述蕲蛇各种情况,当然是得力于实地调查的细致.李时珍了解药物,并不满足于走马看花式的调查,而是一一采视,对着实物进行比较核对.这样弄清了不少似是而非、含混不清的药物.用他的话来说,就是“一一采视,颇得其真”,“罗列诸品,反复谛视”.
2牛顿发现了万有引力
3布朗观察水面上花粉的运动,提出了布朗运动

我只是路过v5

设小车质量为M,砝码和小盘质量为m
T=Ma
mg-T=ma
解得T=mg/（1+m/M）
使m/M尽量小,T才等于mg

副词[fù cí]
修饰或限制动词和形容词,表示范围、程度等,而不能修饰或限制名词的词.如都、只、再三、屡次、很、更、越、也、还、不、竟然、居然等.
副词是一类用以修饰名词以外词语和整个句子的词,修饰名词的词一般为形容词.
一般而言中文在一个词的后面加「的」使其成形容词,加「地」使其成副词,但是现在一般已经不太常做这种区别了.
以副词修饰的句子举例：「一只非常小的虫轻易地钻进了那个洞穴里」,其中[非常]和[轻易]地为副词,小为形容词,虫为主词,钻进为动词,洞穴里指明前往地点.
一些问问题时的所用的词,像如何、谁、何时、什么等在某方面也可视为副词.

The fourth season is winter.December,January and February are the three months of that season.The weather is very cold,and most of the plants die at that time.Sometimes it snows.People can enjoy skating and skiing.But winter doesn' t stay with us for a long time,for spring comes again soon.

There is going to be a meeting at 2pm next Monday.
There isn't going to be meeting at 2pm next Monday.
There are a lot of trees in front of my house.
There aren't a lot of trees in front of my house.
There is a mistake in what you told me.
There isn't any mistake in what you told me./There is no mistake in what you told me.

who和 whom这两个词既可以用作连词引导名词性从句（宾语从句,主语从句,表语从句以及同位语从句）也可以用作关系代词引导定语从句.
1.引导名词性从句.who在名词性从句中,主要充当主语、表语和宾语.who在从句中充当宾语时,如果不是与介词直接连用的话,口语中常常与whom替换.而whom在从句中,只充当宾语.
2.引导定语从句.who在定语从句中,充当的是主语或宾语--这时的情况与名词性从句同.（如果充当表语的话,关系代词用that）.whom在定语从句中,充当的是宾语.尤其是与介词连用时只能用whom.

诗人用质朴无华的语言、悠然自在的语调,叙述乡居生活的日常片断,让读者在其中去领略乡村的幽静及自己心境的恬静.而在这一片“静”的境界中,流荡着一种古朴淳厚的情味.

Good afternoon, everyone!
The topic of my speech today is “Being a Good Listener”.
Good listening can always show respect, promote understanding, and improve interpersonal relationship.
Many people suggest that parents should listen more to their children, so they will understand them better, and find it easy to narrow the generation gap; teachers should listen more to their students, then they can meet their needs better, and place themselves in a good relationship with their students; students should listen more to their classmates, thus they will help and learn from each other, and a friendship is likely to be formed.
What I want to stress is that each of us should listen more to others. Show your respect and never stop others till they finish their talk; show you are interested by a supportive silence or a knowing smile; be openminded to different opinions even though you don’t like them. In a word, good listening can really enable us to get closer to each other.
Thank you for your listening!

解题思路：根据物体所处的状态，选择研究对象进行受力分析，利用平衡条件解出问题．

物体m静止不动，受力平衡．可对物体受力分析，正交分解重力G，得：
支持力 N=mgcosθ
摩擦力 f=mgsinθ
比较可知θ稍微增大一些，N变小，f变大，故A正确、B错误．
对于水平面对斜面的力，最好采用整体法，
对m和M整体进行受力分析：整体受重力和水平面的支持力，
因为整体处于静止也就是平衡状态，所以地面对斜面的摩擦力始终为零．故C、D错误．
故选A．

点评：
本题考点： 共点力平衡的条件及其应用．

考点点评： 根据物体所处的状态，选择研究对象进行受力分析，利用平衡条件解出问题．要注意研究对象的选取，整体和隔离法的应用．

a little better at

A错误,B正确：
物体开始静止,说明合外力为0
物体后来也是静止,说明合外力为0
所以合外力一定没有改变
C正确：
物体对斜面的压力为N=mgcosθ+Fsinθ
F增大,所以压力N一定增大
D错误：
这个说一定是错误的
很有可能原来是这样的情况
物体受到重力,支持力,推力,摩擦力
关系是
沿斜面方向：mgsinθ+f=Fcosθ（也就是推力过大,物体有向上滑的趋势,摩擦力才向下）
当F增大时,很有可能出现mgsinθ=F'cosθ
摩擦力消失了,减小了,所以摩擦力不是一定增大

有一个四位数,设个位上的数字为x,十位数字为y,百位数字为z,千位数字为k.x-k=2,x+y+k=20,2x+y+z=24,2y-k=1.求这个四位数

采用累加的方式
a2-a1=2
a3-a2=4
a4-a3=6
.
an-a(n-1)=2(n -1)
累加,
an-a1=2+4+6+...+2(n-1)
=(2+2n-2)*(n-1)/2=n(n-1)=n^2-n
an=a1+n^2-n=n^2-n+2

公顷是面积单位,1公顷＝10000平方米
所以：0.4公顷＝4000平方米

根据题意,由坡比为2比1,高为1米,再有勾股定理得,两斜坡为1.118即（根号下5）/2
造价为：2*（1.118*500）*30+0.5*500*50=~~~~~~~~
自己算吧

朋友怕冰激凌化掉,学生们见不到冰激凌的样子了.

6小时以上 136+138+129 分钟

注意是热水中：
关键是热量的传递从外向里有一个过程
刚放进热水中的温度计,外面的玻璃先受热膨胀,而使里面的液面下降,然后热量很快传到里面的液体,液体受热膨胀程度大于外面的玻璃,所以液面又迅速上升了.

金星：昏星,由人马座运行到摩羯座,日没时出现于西南方天空,地平高度约23度,利于观测.9日金星最亮,亮度达-4.7等.5日金星合月,金星位于月亮北2度.
火星：在白羊座中运行.11日火星留,留后由逆行转为顺行.日没时出现于东北方(中旬后转东南方)天空中,亮度约-1.1等.12日火
星合月,火星位于月亮南1度.
-------------------------------------
东方是火星,西方是金星.

孩子学习都只能去激发兴趣来推动学习的进步,不要总要孩子去做他们不感兴趣的事情,这样会让他们越来越烦.若是让他们感受到那种获得进步时的那种快乐感,会让他们更感兴趣.可以故意给很简单的东西让他们去做,让他们有这种成绩进步的感觉.多夸多引导,培养好的学习品质是最关键的.另外,也可以给他们一些数学智力题,小学竞赛书中其实有很多智力的趣味题,这种趣味题可以很好的培养他们的学习兴趣.作为父母最好不要急于求成,不要总觉得把考试作为学习上目标,其实给他们做竞赛的有趣的题目,可以很好的培养他们的智力,激发他们的智力,刺激他们不断的去思考问题,这种思考问题的思维和学习的兴趣都建立起来后,那些普通教育中的题目就可以居高临下了.你的孩子的问题是多方面的因素造成的,我们也不可能一次性把所有问题都解决了.只有先解决了主要矛盾,再解决次要矛盾.所以我觉得你的孩子主要的矛盾还是个对数学的兴趣问题,好比一个数学家对诗词没感觉一样.产生兴趣了然后再引导他们形成好的学习习惯,学习品质,最后锻炼出好的学习方法,这样就可以了.这也许是长远的问题,但是却是不变的规律.

对的,你看看啊：
(n+1)!=(n+1)n(n-1)(n-2)(n-3)……3*2*1
n!=n(n-1)(n-2)(n-3)……3*2*1
所以(n+1)!=(n+1)*n!是对的啦

电解池与原电池有什么区别?（正负极、阴阳极；氧化反应、还原反应；电荷移动规律）`（1）能量转化形式：（2）电极材料名称：（3） 电极反应：（4） 反应的异同点：氧化还原反应（自发与非自发） 板书 酸碱盐溶液的电解规律 酸碱盐 电极反应式 电解反应式 PH变化 （A）硫酸溶液 阳：阴：减小 （B）盐酸 阳：阴：增大 （C）氢氧化钠 阳：阴：增大 （D）硫酸钠 阳：阴：不变 （E）氯化钠 阳：阴：增大 （F）硫酸铜 阳：阴：减小 （G）氯化铜 阳：阴：----- 从以上表可以看出,用惰性电极电解酸、碱、盐的水溶液时,其基本规律是：1． 电解无氧酸或无氧酸的中等或不活泼金属盐溶液时,相当与溶质本身被分解.如（B）、（F）、（G）.2． 电解强碱、含氧酸或含氧酸的强碱盐溶液,相当与电解水.如（A）、（C）、（D）.3． 电解不活泼金属或中等活泼金属的含氧酸盐溶液,生成金属、含氧酸和氧气.如：（F）.4． 电解活泼金属的无氧酸盐溶液,生成氢气、碱和金属单质.如（E）.PH值的变化：（1） 析氢吸氧（2） （一）阴极出氢气,阳极不出氧气（二）阴极不出氢气,阳极出氧气（三）阴极出氢气,阳极出氧气,电解水.板书 二．电解原理的应用（一） 电解饱和食盐水 (-) (+) 阴极（Fe） 阳极（C）NaCl === Na+ + Cl-H2O=== H+ + OH-阳极：Cl- 、OH-阴极：Na+、H+放电能力：Cl->OH-;H+>Na+阳极：2Cl- -2e === Cl2(氧化反应)阴极：2H+ + 2e == H2(还原反应)现象：两极均产生气体,阳极气体有刺激性气味,能使淀粉碘化钾试纸变蓝,两极滴加酚酞,发现阴极区酚酞变红.阴极：由于氢气的产生而破坏了阴极区水的电离平衡,使氢氧根离子浓度增大,生成氢氧化钠,所以滴加酚酞显红色.板书 总反应方程式：2NaCl + 2H2O === 2NaOH + H2 + Cl2 (阴极区)（阴极）（阳极） 简介 设备：立式隔膜电解槽 阳极：金属钛或石墨 阴极：铁丝网（附在一层石棉绒）阳极室 阴极室隔膜作用：氢氯混合易爆炸、氯气与碱发生反应.氢氧化钠、氯化钠的分离：加热蒸发,析出氯化钠晶体（重结晶）流程：溶盐、精制、电解、提纯.板书 （二）铝的冶炼 介绍 铝是地壳含量最多的金属元素,又是用途很广的金属,但是由于他是较活泼的金属,自然界没有单质铝存在,很难制取他.用钠还原氧化铝,成本很高,不能大量生产,1886年,青年科学家霍尔发明了用电解法制铝以后,才大量生产铝.板书 基本原料：铝土矿（Al2O3）纯氧化铝 熔点：2045 难熔化助熔剂：Na3AlF6电解槽：长方形,外面是钢壳.内村耐火砖 碳作槽池（阴极）、两个碳快作阳极.阴极：4Al3+ + 12e === 4Al阳极：6O2- - 12e ==== 3O2总反应方程式：2Al2O3=== 4Al + 3O2C + O2 === CO2液态铝的密度大于熔融冰晶石-氧化铝的密度,沉于槽底,定期取出.板书 （三）电镀：应用电解的原理在某些金属表面镀上一层其他金属或合金的过程.目的：使金属增强抗腐蚀的能力,增加美观和表面硬度.实验 （-） （+） 阳极：Zn -2e === Zn2+ Fe Zn阴极:Zn2+ + 2e === Zn ZnCl2 ZnCl2 电镀的结果：阳极的锌不断溶解,阴极的锌不断析出,且减少和增加锌的质量相等.电解质溶液氯化锌的浓度不变.阴极：待镀物件阳极：镀层金属电解质：镀层金属盐特点：阳极本身也参加了电极反应（失电子溶解） 介绍 铜的精炼.练习 用石墨作电极电解硫酸铜溶液（体积为1L、1mol/L）当电路通过0.5mol电子时,溶液中铜离子浓度为 ,氢离子浓度为 ；然后将电源反接,又通过1mol电子,溶液中铜离子浓度为 、硫酸根离子浓度为 、氢离子浓度为 .（

导析：两只公雁的同情给走投无路的五小鸭带来一点生活转机,但这种转机并没有在他的生活中实现,这样写一方面使故事情节波澜起伏,另一方面增强了丑小鸭命运的悲剧色彩,使丑小鸭的命运更令人同情.
文中的猎人实际是丑小鸭命运转机的终结者.

我想和你认识,你愿意和我做朋友吗?你给我留下了美好的印象.
I want to know you.Will you be my friend You left me with a good impression.

3x=6-x
4x-1=3+6
5X+8=6X-7
5x+15-2x-2=10
2x-4+5-5x=-1
1 50-3x=20
2 3（x+2）=8
3 7X-6=8
4 5(2x+7)=55
5 （8-x）（6-2X)=10
6 9x-8x=19
7 5X+40=100
8 36-15x=6
9 4x-8=3x+19
10 7x+5=54
11 1/2+1/6+1/12+x+1/30=1-1/30
12 0.6x+x/10-0.2=6/5
13 2-(3x/8+1/6÷1/3)=35/24
14 3.5/105=x/33
15 7.5:x=24:12
16 1/3：x=5:6
17 2x/3-x/5=4.9
18 6.4x-2.4x=3.6
19 23×2.5+2.5x=100
20 1×2×3×4×5×6x=4×5×6×7×8
21 8X+4=20
22 50-3x=20
23 3（x+2）=8
24 7X-6=8
25 5(2x+7)=55
26（8-x）（6-2X)=10
27 9x-8x=19
28 5X+40=100
29 36-15x=6
30 5x-2(x-1)=17

如果是稍微用力一般不会坏的,这样平拉有具体的测试数值的

这篇写篮球的,很简单的了,后面还有中文意思了:)~~
My favorite activity is playing basketball. I started playing when I was in elementary school. I began playing it because all the other boys in my neighborhood enjoyed it.
Now I play basketball twice a week. It is good for me both physically and mentally. Physically, it helps me maintain my strength and endurance and keep my weight down. Mentally, it provides me with an interesting challenge and is a good way to relieve any frustrations which I have from school. I really love basketball.
中文意思:)~
我最喜欢的活动是打篮球.我从小学开始打篮球.我开始打篮球是因为住在我家附近的孩子们都喜欢打篮球.
我现在每星期打两次.打篮球对我的身心两方面都有好处.在身体方面来说,它帮助我维持体力,耐力和减轻体重.在精神方面,它提供我一种克服困难的力量,它也是舒解功课方面招致的挫折感的好方法.我真的非常喜欢打篮球.

a girl and a boy were on a motorcycle,speeding through the night.
一天夜里,男孩骑摩托车带着女孩超速行驶
they loved each other a lot..
他们彼此深爱着对方
w:" slow down a little..i'm scared.."
女孩：“慢一点...我怕...”
m:"no,it's so fun.."
男孩：“不,这样很有趣.”
w:"please...it's so scary.."
女孩：“求求你...这样太吓人了...”
m:"then say that you love me.."
男孩：“好吧,那你说你爱我...”
w:"fine..i love you..can you slow down now?"
女孩：“好.我爱你...你现在可以慢下来了吗?”
m:"give me a big hug.."
男孩：“紧紧抱我一下...”
n:the girl gave him a big hug.
女孩紧紧拥抱了他一下
w:"now can you slow down?"
女孩：“现在你可以慢下来了吧?”
m:"can you take off my helmet and put it on?it's uncomfortable
and it's bothering me while i was driving."
男孩：“你可以脱下我的头盔并自己戴上吗?它让我感到不舒服,还干扰我驾
车.”
n:
the next day,there was a story in the newspaper.a motorcycle had crashed into a building because its brakes were broken.
there were two people on the motorcycle,of which one died,and the other had survived...
第二天,报纸报道：一辆摩托车因为刹车失灵而撞毁在一幢建筑物上车上有两个人,一个死亡,一个幸存...
(男孩女孩变成天使说话,简单化妆让大家知道这是个天使就行)
m：i knew that the brakes were broken.i didn't want to let the girl know,because i knew that the girl would have gotten scared.
我知道刹车失灵,但我没有让女孩知道,因为那样会让女孩感到害
怕.
w:
instead,he let me tell him the last time that i love him,ask for a hug from me,and put his helmet on my head so that i can live,and die himself...
相反,他让我最后一次说我爱他,最后一次拥抱他,并让我戴上他的头
盔,结果,我活着,他自己死了...
n：once in awhile,right in the middle of an ordinary life,love gives us a fairy tale...
就在一会的时间里,就在平常的生活里,爱向我们展示了一个神话
每天你都有机会和很多人擦肩而过,或者你对他们一无所知,不过某天他会变成你的朋友或知已.是的,人海茫茫,相识是缘,相知更是前世修,让我们朋友越来越多,生活越来越好……

大致改了下,楼主看是否合用,说实话原文还是差了一些.
Hi, ladies and gentlemen, my name is Elijah. I am a 13-year-old 'gentleman' because my classmates always regard me as "a really gentleman". However, I know what they really think is that I am boring, but I could not find out the reason. Therefore, today I am about to talk about what kind of person I am.
In my humble opinon, I am a person who have good temper most of the time. For instance, if one lends his/her friends a pen and the borrower broke it, usually the lender will ask for a new one or charge the borrower money equals to the pen's value instead. However, if it happens to me, being the lender, I will not ask for those but to forgive the borrower without charging him/her anything. Of course except for the thing one breaks is the most valuable one.
I got some sense of humor at times, I have just told one of my friends a joke three months ago and he laughed for the whole day. It was about an Equivalent substitution that “The customer is God,God is a girl,so the customer is a girl.” It is so funny, isn't it?
Last but not least, I have a special talent on mathamatics and I do good in exersices and exams, classmates are very welcomed to come to me when problems relating to math occurs.
In a word, I am a nice person and I can be interesting, why not being friend of mine?
[原创,禁止转载,作者保留所有权利]

Finally busy days are passed,I can take a rest.

解题思路：对活塞进行受力分析，前后两个过程活塞均处于受力平衡状态，可以判断气缸内气体压强的变化，然后根据理想气体状态方程得到气体体积的变化，得到密度变化情况．

C、D、当气缸竖直放置时，对活塞受力分析如图，

所以，P₀S=G+PS ①
即外界大气压力等于重力与内部气体产生的压力之和．
当气缸倾斜时活塞受力如图，

此时：Gcosθ+P₁S=P₀S ②
由①②可知，P₁＞P，即末状态压强大于初状态，故C正确，D错误．
A、B、整个过程是绝热变化，由PV=C可知，压强增大时，体积减小，故密度变大，外界对气体做功，根据热力学第一定律知内能增大，故A正确，B错误．
故选：AC．

点评：
本题考点： 热力学第一定律；封闭气体压强．

考点点评： 此题把受力平衡与理想气体状态方程相结合，所以在解题过程中思维不要仅局限在理想气体状态方程和热力学第一定律上．

All people know a little history of the United States may know the first sentence of the declaration of independence of United States is " All men are created equal " , to reflect the quality of Toyota is better than others. Because of the declaration of independence to americans is well-known, when americans see this AD,they will have the familiarity, the familiarity makes target audience paying minimum effort when cognize the AD, the declaration of independence in the minds of americans is noble, the AD used the first sentence, let target audience heartfelt like to achieve best contextual effect. This is the formation of optimal relevance. No doubt the AD was successful.

肖像描写，表现韩麦先生对最后一课的珍惜，对失去国土的敬意。（意思对即可）

United Statesofficially United States of AmericaFederal republic,North America.It comprises 48 contiguous states occupying the mid-continent,Alaska at the northwestern extreme of North America,and the...

Lushan Mountain is located in the northern part of Jiangxi Province,to the south of the Yangtze River and northwest of the Poyang Lake.According to records,it has a history of more than 2,000 years.The scenic area,covering 302 square kilometers,houses 16 natural wonders,474 scenic spots and 171 peaks,of which the highest peak,the Dahanyang Peak,is 1,474 meters above sea level.
The scenery in Lushan Mountain scenic area is breathtaking.It is full of sheer peaks and precipices,changeable clouds and fogs,silver springs and flying waterfalls.The flora is diverse and comprises about 3,000 species.Features of glaciation during the Quaternary Period make Lushan Mountain even more mysterious.There are millions of migratory birds in the Poyang Lake area.The dancing of the largest number of cranes over the water makes it a world wonder.
庐山中文介绍庐山位于长江中游南岸江西省九江市南,中国第一大淡水湖鄱阳湖滨,是座地垒式断块山.相传在周朝时有匡氏七兄弟上山修道,结庐为舍,由此而得名.自古享有“匡庐奇秀甲天下”之盛誉.大山、大江、大湖浑然一体,险峻与柔丽相济,素以“雄、奇、险、秀”闻名于世.是中国名山之一,有雄奇挺秀的山峰,变幻莫测的云海,神奇多姿的流泉瀑布,文明悠久的历史古迹.庐山区长约25公里,宽约20公里,最高峰汉阳峰海拔1474米,牯岭街1167米,巍巍的庐山,远看有如一山飞峙大江边,近看千峰携手紧相连,横看铁壁钢墙立湖岸,侧看擎天一柱耸云间,正如宋代大文豪苏东坡诗云：“横看成岭侧成峰,远近高低各不同,不识庐山真面目,

u m

图表11和14分别反映出了5个需求工程和13个系统的结构因素,在质量的提高审核和确认水平上的调查结果.这些因素体现在横轴上的条形图当中,结果被汇总来显示质量核查和验证水平被提升的百分比例,最后通过垂直的条形图显示出来.例如,图11优先考虑系统的要求（左起第三条）从而使25 ％的项目在质量的核查和验证方面有了显著提高.而图14 系统架构模块化方面的提升（右起第一列）也使33 ％的项目的系统架构在质量的核查和验证方面有了显著改善.图表12和13显示了项目当中改进需求工程和系统架构的活动所占的百分比,也正是这些导致了在质量的改善核查和验证方面出现了三个不同的层次.

直链的话根据氯的位置可以有三种；支链有两种情况：当主链是四个碳的时候,有五种情况；主链是三个碳的时候,有一种

I need a room to live in.
to live in是动词不定式作定语.live是不及物动词,所以要加in.如是及物动词,那就不用介词.如： I have something to say.to say是及物动词.修饰something .

锻造车间的厂房结构必须是极为坚固的,应该具有良好的自然通风条件和采光条件,地面的铺设要符合热加工生产的特点,车间的跨度、高度和面积更适应设备布置、安装和组织生产的要求.