老师好：我初三、动能和势能、由于前几天生病请假、对动能和势能不是很清楚、公式有什么?

老师像一棵大树,为我们遮风挡雨.
辛勤的园丁
春蚕到死丝方尽,蜡炬成灰泪始干.
老师,人类灵魂的工程师,有谁不在将您赞扬!
您的爱,太阳一般温暖,春风一般和煦,清泉一般甘甜.

定义；单质必须是由同种元素组成的纯净物,混合物不可能是单质.元素在单质中存在时称为元素的游离态.
化合物由两种或两种以上的元素组成的纯净物.
氧化物（oxide）是指由两种元素组成且其中一种是氧元素的化合物
窍门；
1 最简单的方法是看化学式,只有两种符号其中一个是0一定是氧化物,如 Fe0
2 只有一种符号的是单质,如02,Zn
3 好几个符号的就是化合物像C2H50H
4 写不出化学式的一定是混合物,像空气,海水,注意,还有的混合物能写出“化学式”,像Hcl溶液,但是它是溶液了,就一定有水混合就是混合物,一听XX水就是混合物但除了蒸馏水.
5 还要了解一些俗名,像生石灰,就是Cao,是纯净物,再看它只有两种符号,还有一种是0,那就是氧化物
有什么不懂的可以求助我

对光滑斜面来讲：FS=Gh,因为Gh,即有用功不变,斜面越长时,力越小.
机械都有这个特点：费距离的,就省力.
但机械效率会变小.
原因：斜面越长,说明斜面越接近水平,这时,物体对斜面的压力越大、摩擦力越大,同时斜面还变长了,这时,克服摩擦力做的功fs会增加——即额外功增加——机械效率会变小.
不明追问.

老师好,同学们好,我是第五组的组长.我们组的project的主题是mixed feelings,首先,允许我先介绍一下自己和我的四个组员,我叫.,来自山西,他是.,来自内蒙,他是.,来自安徽,她是.,也是来自山西,他是.,来自安徽.
Hello, ladies and gentlemen, I'm the lead of Group Five. The theme of the project of our group is mixed feelings. First, let me introduce myself and the four members of my group. I'm xxx, from Shanxi; he's xxx, from Inner Mongolia; he's xxx, from Anhui; she's xxx from Shanxi, and he's xxx from Anhui.
在我们的日常生活中,我们会欢喜,会忧愁,会伤心也会兴奋,但是大家对这些情绪有一个系统的了解吗?接下来,由我们组的.开始给大家介绍我们生活中的种种情绪之一——开心.
In our everyday life, we would experience happiness, feel sadness, disappointed, or excited. But, does everybody know these feelings in a systematic way? Next, Mr. xxx from our group will show us one of the feelings in our life, happiness.

孔君平来拜访他的父亲,父亲不在于是就唤了他儿子出来.

多看青春小说,因为那些书里面描写人物景物心情状态等都描写得十分生动,我以前作文只能的三十几分,满分五十分,我也经常看,家里有一堆书各类各样的,现在作文分总是在四十五左右,都没低过四十三分

I like other people call me goenglaux ,at the same time ,hope I will get along with classmates and teachers for this three years.

T/2=7π/18-π/18=π/3
T=2π/3=2π/w,w=3
f(x)=2sin(3x+φ)
再根据x=π/18时的y值,是最大值还是0代入求φ即可.

还是 应该多做题吧
先把老师讲过的题做熟
然后 遇到新题的时候不要慌
从题干的每句话一点点分析
想想这句话能用到什么公式
开始可能会有点吃力
但是时间长了肯定会有提高
再有注意上课时候老师的解题步骤和思路

Hello (Good morning/afternoon), dear judges and friends, my name is lin XX, today I am have the honor to participate in this competition and I hope to accomplish my goals and fulfill the expectations of my teachers and peers.
I love English as a subject, not only because it is useful as a tool for communicating with others, but also because it is an fascinating language to learn and master. Some people learn English only because they have to for tests or for talking with foreigners, but for me, studying English is very fun even when not accounting its practical aspects. For examples, some people may find memorizing new vocabulary to be very boring and troublesome; but for me, every new word learned brings me joy and it's wonderful to learn that so many different and interesting words can be made using only twenty-six letters. Furthermore, in my daily life, using English also brings me great joy. For example, when I read a English book without needing translations or watch a English show in its original sound, I feel great and confident for understanding the conversations and able to understand the plot of the story. One of my hobbies is to read English aloud and to try to find the most accurate and natural pronunciation for it. Sometimes when I watch American shows, I read the captioning of the shows aloud without even realizing that I'm doing it, and at some of these times, I feel that I am really born to learn English. Just like I said: I absolutely adore English.
Thank you very much.

Dear tearchers,
My name is Lujiaying, I'm twelve years old, I live at Xuefu Road. I'm in Class 2 Grade 5 branch school of Wangzhaoxin Primary School. My favourite colour is blue, my favourite class is Chinese. I love the beautiful and vivid words, and I also like classical Chinese poetry. I take "Good beginning is half success" as motto. This is me, a quiet and sometimes outgoing girl. Hope you can remember me. Thank you all!

坐标控制点布设方法有全站仪导线法,RTK法等.
1、首先确保工地上的控制点位要能长期保存,稳定.不受施工影响的破坏.
2、用全站仪从已知的坐标控制点开始,用导线的方法,得出布设控制点的点位坐标.
3、导线方法是通过已知控制点的坐标和全站仪测得的边长和角度来换算的.
GPS法就更简单,利用已知控制点,求得RTK参数后,直接在想布设的控制点上做控制点测量即可.
至于全站仪学习,原来都是一样,但每一款仪器的操作略有不同,建议先弄懂原理,在看说明书就可以事倍功半了.
希望对你有用.

Unit7 How much are these socks?
much 许多；大量；多少
How much...（购物时）……多少钱?
sock 短袜
T-shirt T恤衫
shorts (pl.) 短裤
sweater 毛衣
trousers (pl.) 裤子
shoe 鞋
skirt 裙子
dollar 元（美国、加拿大等国的货币单位,符号为$）
big 大的；小号的
small 小的；小号的
short 短的,矮的
long 长的
woman (pl.women)女子
Call I help you?我能帮您吗?
need 需要
look 看；看上去
pair 一双；一对
take 买下；拿；取
Here you are.给你.
ten 十
eleven 十一
twelve 十二
thirteen 十三
fifteen 十五
eighteen 十八
twenty 二十
thirty 三十
Mr． (用于男子的姓氏或姓名前)先生
clothes (pl．)衣服；服装
store 商店
buy 购买；买
sale 特价销售：出售
sell 出售；销售；卖
all 所有的；全部的
very 很；非常
price 价格
boy 男孩
a pair of 一双

Good morning/afternoon/evening,my dear judges.My name is SunZhe, a girl from the northen of China. lively open as me , I am persistent for a lot of things.For exemple, I started to learn to play the piano from the primary school,and have never stopped practising for so many years . I like playing the piano, because it feels calm and wonderful to hear the music made by myself.
Speak of love of parents ,I think I owe my parents a lot.My parents help me to find my shining point and encourage me to chase for what I am good at when I was young .Without them ,I think I would not have stood here today.I plan to become more versatile in the future as a respect to the great love of my parents.
My hometown locates in Jix,Heilongjiang provence,a small city famous for its coal . I love the city very much , although the region is not very broad, but it is special to me, because it is the place where I grew up.

Hello/Good evening/afternoon/., everyone . I'm number XXX,from Hangzhou,a very beautiful city. I'm a lively girl, and sometimes I cound be shy as well. I have a lot of habbits , such as playing badminton, singing and dancing .Next , my talent show is to sing a English song, it's name is my love will get you home .
.
thank you(鞠躬）

whoever
这里whoever (you think) likes them是介词to后面的宾语从句,从句中you think正如你所说,是插入语,可以拿掉,likes是谓语,them是宾语,缺少主语,所以用whoever,不用whomever.

（2014x.x1）/（2014+.+1）+2

东南数理化初中物理孙老师好不好呀?……在东南数理化的孙老师就很好了,我儿子是十月份才过来东南数理化的,我先让他试试看,就给他报了物理,我小孩不怎么讲话,比较内向,我就害怕他有什么问题也不会问老师,也拜托孙老师帮我盯着点,这次期中考试他回来又没说话,我以为他考不好,没多说什么就安慰了他几句,结果他猛的蹦出来一句话：“我物理考第三名”,这句话把我吓得,要知道,我儿子物理以前也就及格线以上还不稳,这次考的这么好全靠孙老师,另外我又帮儿子加了一门化学,看到儿子的进步,我真的很开心.

是铝元素,形成氢氧化物为Al(OH)3,即氢氧化铝.
方程式为：KOH+Al(OH)3=KAlO2+2H2O

你可以用特殊的例子,比如直角三角形ABC,C为直角.sinA=a/c sinB=b/c sinC=1,代入题目的公式里,就可以得出答案为c,而且a/sinA也等于c.

Distinguished teachers and judges,good morning.I'm Ma Qiming,18 years old,from a beautiful city He ze,Shan Dong.First,I want to make a brief self-introduction.I'm positive towards life which I love so much.To be frank,I'm a sociable,warm-hearted and responsible young man.I have various hobbies,such as doing excercise, on-line chatting,listening to music,watching movie and reading.It's my great honor to be here today.Thank you.

在我身边，在学校里，到处都是好老师，他们认真负责，伟大无私，像辛勤的园丁，用自己的心血，精心地浇灌着花朵；老师是我们的引路人，让我们知道天有多高，地有多厚…… 她中等的个子，一头乌黑的亮发，一双明亮的大眼睛，一张圆圆的脸，显出知识分子常有的那种体态，便是我们的班主任李老师，她却有一股神奇般的力量，常常鼓舞着我们，支持着我们，温暖着我们，于我们相处近三年了。 李老师对每个同学的要求都十分严格，而...

矩阵行等价? 是指行向量组等价?
那么 A^2 与 B^2 一般不会行等价
如:
A=
1 0
0 0
B=
0 0
1 0

（1）3千克煤可以发电6千瓦时.平均每千克煤可以发电多少千瓦时?每发1千瓦时电需要多少千克煤?6/3=2千瓦时,1/2=0.5千克 答：平均每千克煤可以发电2千瓦时,每发1千瓦时电需要0.5千克煤
（2）用一根长34.5米地绳子剪跳绳,如果没跟跳绳长2.3米,最多可以剪多少根这样长的跳绳?还剩多少米?
34.5/2.3=15根,没有剩下
（1）5.543÷6.2=6543÷（ ）=（ ）÷62 8.9÷0.96=（ ）÷960.745÷（ ）=7.45÷45
（ ）÷0.45=780÷4.5
这个题目有没抄写错?
（2）一块长方形的面积是11.96 dm2,如果长是5.2分米,它的周长是（ ）分米.
宽;11.96/5.2=2.3 周长：（2.3+5.2）*2=15分米
③跳一跳
一个数扩大到原来的100倍之后,比原数多100.98,原数是多少?100x=x+100.98,解得x=1.02

你好,这个需要结合实际情况来看的额,以下仅供参考,希望能帮助到你.
如：
我们电脑老师是个既幽默风趣而又严肃负责的好老师,上课时老师认真教我们各种计算机知识和技能,监督我们不准偷偷上网.下课后,他有会与我们交流我们在运用电脑方面长遇到的问题,还会为我们家提供一些关于电脑的好网站和好软件.在老师的认真帮助和辅导下,我们的对电脑的认知和运用能力得以很大提升.

别烦,我六年级的时候,一天两三篇作文,还要自己写呢!质量有要好.我都熬过来的,把身心投入到作业中,不知不觉就写好了.到了初中,你会很快适应新的的生活,祝你好运!

我只能这样说,如果是我自己我毫不犹豫的选择自学.
我现在读大学三年级,告诉你大学学的是什么,大学真正学的东西不是知识,因为工作根本一点都用不上,大学学的是自学能力.
找家教也不一定比自学好,更何况你是想早点学完数学,如果找家教你就要跟着他的脚步走,根本一点都没有自己发挥的余地.
你可以买一本课本的习题解答,先看课本,看一节或一章就做后面的习题,过程你肯定会发现当你看后面的东西前面的都已经忘记很多了,你不要慌张,这是正常的,当你把一本书全部做完以后再买一本综合的习题来做,你要相信,理科离开题海战术就不可能得到高分,数学也是一样,多做题一定会有效果的.祝你学习进步,取得好成绩!

My name is XXX . I'm 14 years old, and I study in No. 1 Middle School of
Hui'an. My school is very big and beautiful. I'm very happy in the school.
I usually get up at 6:15 in the morning. Then I do morning exercises
in the playground. At 6:40, I have my breakfast. You can see many students and
teachers in the dinning room. After breakfast, I often read English with my
classmates.
We have six classes every day. The first class begins at
7:50 am. I like all the classes, because my teachers can make the classes lively
and interesting. My favorite subject is English, so I join English Corner every
week. I can speak English with many other students there. It's very interesting
and exciting. I think it's helpful for me to learn English well. After class, I
always play games with my friends. We play basketball, soccer ball, volleyball,
ping-pong and so on. They are very relaxing.

hi!Mr/miss.I am xxx,I am from Grate6.I am 13 years old.My hobbies are music and running.My favorite subject is math because it is interesting.I am outgoing and active. And I like making friends.Everyone has their own dreams. My dream is to be a good policeman.,because I can help others and protect my country.

Hi,everybody ! This is my family. I have three family members, this is my father, this is my mom, they are all power plant workers. I was born from live the dormitory area of the power plant, the plant has been a history of 20 years, my mom and dad after graduating from high school is working in this factory. Three of us are fond of reading, my dad likes to read the books on philosophy of history, my mom likes to read magazines, I like to read literature books. There is a bookcase in our house, there is a wide variety of books, above have the reader's digest, Jane eyre and a dream of red mansions, also have the daodejing "the rise of great powers" currency war "and so on. My mother also like growing flowers, all kinds of flowers on the balcony.

如果说好的题材是作品的搏动的心脏的话，那么，优美的语言该是美丽的面庞了。考生依托语言的载体，向阅卷老师展示写作才华，语言是否有亮点，是否有出彩之处，直接影响了印象分的判给。很多改卷老师说：“一篇作文，出现‘月亮’，最好不过；如果没有‘月亮’，‘群星璀璨’也很好；没有‘群星璀璨’，出现‘数颗星星’也就不错；千千万万不能给阅卷老师看的是‘茫茫黑夜’、‘漆黑一片’。”考生平时习作中有意识的追求，考试中熟...

Mainland Australia, with an area of 7.69 million square kilometres, is the Earth’s largest island but smallest continent. It stretches about 3700 kilometres from north to south and 4000 kilometres fro...

氧气是有氧气分子O2构成的,铁是有Fe原子构成的

1、其实你也可以将电场简化为一个电荷,
2、你的负电荷是向着电场正电荷方向移动的（电场是正功）.
3、那么电场强度和负电荷的大小是一定的,
4、那么电势的决定因素就是两点之间的距离.距离小了,电势就小了.
可以这样理解啊.

例如：PH=0 ,表示溶液是酸性的.例如温度为零,表示是比较冷.哈哈

看到了,做一下：
翻译：
1.all the world 2. one or two years 3. make a good result 4.have a performance class 5.keep healthy 6.at the same time 7.look for a part-time job 8.hold an art exhibition 9.make some money 10. make a determination for a new year
单选
11-15 ACDBB 16—20 CADDC 21-25 BABBC
好好学英语,将来很有用的哦!有问题随时联系

人们通常把童真的还只比喻成幼苗、花朵、小树等,而培育这些幼苗、花朵、小树的老师就像园丁一样,用智慧、爱心和汗水浇灌、培育、呵护着园子里的每一株幼苗,使他们枝繁叶茂,姹紫嫣红,茁壮成长.
“春蚕到死丝方尽,蜡炬成灰泪始干.”就算是这不朽的佳句也无法表达我们对老师的崇敬!
老师是一个平凡的职业!她是一支蜡烛,燃烧自己照亮了他人.是老师用辛勤的汗水浇灌我们幼稚的心理.当我们慢慢长大回忆往昔,有多少慈爱的面孔浮出我们的脑海,多少辛勤的身影浮现在我们的眼帘……
多少个夜深人静,您还在独自一人不停地批改我们的作业,直到改完为止!您对我们是这样的关怀,天冷了,看到有的同学衣着单薄,您马上走过去问：“孩子,冷不冷?要不要穿老师的?”您的话语温暖了我们的心灵!老师,您为我们做了太多太多无私的事情,而你却只希望我们能够好好的听老师的话,这就是我们给你最好的回报.
老师,您那亲切、期盼的眼神,穿过我们荒芜的心,留下一片绿意；你那满载温度的呵护,让我们在寒冷的世界瞬间解冻；又有多少辛勤的汗水,洒落我们的贫瘠的精神土地!
六年转眼就过去了,离开我们最心爱的老师,师恩难忘,感谢老师六年来对我们的关怀.感谢老师领着我们向前进,感谢您传授给我们知识老师,您在我们的心中永远是最伟大的,最值得我们敬佩的人.我们在知识的瀚海里开始起步,有您的一路陪同；我们在坎坷的求知路上跌跌撞撞,总有您宽厚的胸膛为我们疗伤.是您让我们懂得了做人的道理；是您让我们知道了学习知识的重要性以及我们学习是为了什么……当我第一次跨进校门时,您阳光般的笑容僵我们那颗恐惧的心带进了学习的殿堂.当我怀着疑惑的心面对一道难题时,您耐心细致的讲解给我新的思路.您将我那颗困惑、堵塞的心带到了难题中,带进了一举反三的解题思路中,也带进了趣味无穷的数学天地.当我怀着惭愧的心面对错误时,您意味深长的教诲给我做人的道理.您将我那颗幼小的心,无知的心带到了正确的道理中,带进了我日后要正确面对错误的信念中,也带进从错误的信念中,也带进从错误走向正确的生活中.当我们怀着失落的心面对失败时,您天使般的来到我身边给我勇气与希望.您将那颗受伤、气馁的心带到了“自信”的“天空”中,带进了坚强的“海洋”里,也引导着我迈入成功的大门.当我怀着喜悦的心对待成功时,您善意的提醒我要谦虚.您将我那颗骄傲、浮躁的心带到了严格的“高山”上,带进了上进的“流水”中,也带进了自强不息的世界里.

德艺双馨,为人师表,鞠躬尽瘁,德高望重,

hello,everyone. My name is XXX. I am 17 years old. Today I am very happy to stand here. I am from XXX school. In my spare time, I like reading and playing guitar. I hope I can show my confidence to all of you. Today, my topic is .

viscid 表示的是粘质的 胶质的
viscous偏向液体或者流体状的粘

你可以去看一些例句分辨出其中的区别. 如有帮组,望采纳哦!

场合不对!

已知f(x)=1/x,g(x)=√x,求f[g(x)]的定义域?f[g(x)]是复合函数吗?
f[g(x)]=1/√x,定义域：x>0,即(0,+∞）;
f(x)=1/x=x⁻¹是幂函数,f[g(x)=1/√x=x⁻¹/²也是幂函数,因此f[g(x)]不是复合函数.
复合函数必须是由不同的基本初等函数经过有限次复合而成的函数.
比如y=lnsin(x²+1)就是有y=lnu,u=sinv,v=x²+1复合而成.
但y=(x²)³就不你认为是复合函数,因为y=(x²)³=x⁶就是一个幂函数.

You judge a good teacher. I am from the beautiful Baotou, temporary number I is xx. My height is 164 cm. Weight 42 kg. Graduated from the Military Academy at Baotou Steel experiment. I am good at writing and running. I bring the talent is the pipa thunder. For translation, thank you teachers hope that the judges like me, remember me.

同素异形体,是同种元素在原子分子级别上构成物质的差别.
比如碳中的石墨和金刚石,氧中的氧气和臭氧,磷中的红磷和白磷.
同位素是核子级别的差别,并不会影响原子分子级别的差别
（当然D2和H2的理化性质还是有较明显的区别）
但是高中化学,就按定义来,H2和D2不是同素异形体.

为你解答.
There is a beautiful river in that village.
在那个村子里有条河.
解释：这是个主谓结构的句子.
主语：a (beautiful) river
谓语：there is
地点状语：in that village

A HCl
B CO2
C CO
D Fe2O3
E CaO
F H2O
G H2

Good morning / afternoon teacher(s). I am fromm XXX school. I am outgoing, energetic, hard-working, patient and devoted. I like white clouds and dream of the blue sky and long to be the same height as them. Therefore, I believe I can do the job working in an airplane well. My sister is one of stewdesses, who told me the fantastic feeling in the sky. I hope you can give me this opportunity. Thank you.

方法1：
x²-x-30
=x²+(5x-6x)-30
=x²+5x-6x-30
=x(x+5)-6(x+5)
=(x-6)(x+5)
所以原方程即：
(x-6)(x+5)=0
方法2：十字相乘法
用十字相乘法分解因式得：
1 -6
╳
1 5
即得：
(x-6)(x+5)=0