=n*(n-1)*(n-2)*(n-3)*.*3*2*1.例如5!=5*4*3*2*1=120.+2!+3!+.+199

楼上的都错了,应该是:
5,100,981:five million.one hundred thousand.nine hundred and eighty-one.

针对初中化学要求掌握的如下：
俗名 主要成分化学名称 化学式
水银 汞 Hg
白金 铂 Pt
硫磺 硫 S
金刚石、石墨、木炭 碳 C
白磷、红磷、黄磷 磷 P
盐酸、 氢氯酸 HCl
硝酸 HNO3
硫酸 H2SO4
双氧水 过氧化氢 H2O2
烧碱、火碱、苛性钠 氢氧化钠 NaOH
苛性钾 氢氧化钾 KOH
消石灰、熟石灰 氢氧化钙 Ca(OH)2
碱石灰NaOH,CaO
碳铵 碳酸氢铵 NH4HCO3
硫铵 硫酸铵 (NH4)2SO4
干冰 二氧化碳 CO2
生石灰、 氧化钙 CaO
苏打、纯碱 Na2CO3
小苏打、 碳酸氢钠 NaHCO3
口碱 结晶碳酸钠 NaCO3．10H2O
明矾 硫酸铝钾 KAl(SO4)2．12H2O
胆矾 硫酸铜 CuSO4．5H2O
草木灰 碳酸钾 K2CO3
灰锰氧、PP粉 高锰酸钾 KMnO4
大理石、石灰石 碳酸钙 CaCO3
铜绿、孔雀石 碱式碳酸铜 CU2(OH)2CO3
甲醇 CH3OH
赤铁矿 三氧化二铁 Fe2O3
磁铁矿、铁黑 四氧化三铁 Fe3O4
醋酸 乙酸 CH3COOH
初中常见物质的化学式
氢气 碳 氮气 氧气 磷 硫 氯气 （非金属单质）
H2 C N2 O2 P S Cl2
钠 镁 铝 钾 钙 铁 锌 铜 钡 钨 汞 （金属单质）
Na Mg Al K Ga Fe Zn Cu Ba W Hg
水 一氧化碳 二氧化碳 五氧化二磷 氧化钠 二氧化氮 二氧化硅
H2O CO CO2 P2O5 Na2O NO2 SiO2
二氧化硫 三氧化硫 一氧化氮 氧化镁 氧化铜 氧化钡 氧化亚铜
SO2 SO3 NO MgO CuO BaO Cu2O
氧化亚铁 三氧化二铁（铁红） 四氧化三铁 三氧化二铝 三氧化钨
FeO Fe2O3 Fe3O4 Al2O3 WO3
氧化银 氧化铅 二氧化锰 (常见氧化物)
Ag2O PbO MnO2
氯化钾 氯化钠(食盐) 氯化镁 氯化钙 氯化铜 氯化锌 氯化钡 氯化铝
KCl NaCl MgCl2 CaCl2 CuCl2 ZnCl2 BaCl2 AlCl3
氯化亚铁 氯化铁 氯化银 （氯化物/盐酸盐）
FeCl2 FeCl3 AgCl
硫酸 盐酸 硝酸 磷酸 硫化氢 溴化氢 碳酸 （常见的酸）
H2SO4 HCl HNO3 H3PO4 H2S HBr H2CO3
硫酸铜 硫酸钡 硫酸钙 硫酸钾 硫酸镁 硫酸亚铁 硫酸铁
CuSO4 BaSO4 CaSO4 KSO4 MgSO4 FeSO4 Fe2 (SO4)3
硫酸铝 硫酸氢钠 硫酸氢钾 亚硫酸钠 硝酸钠 硝酸钾 硝酸银
Al2(SO4)3 NaHSO4 KHSO4 NaSO3 NaNO3 KNO3 AgNO3
硝酸镁 硝酸铜 硝酸钙 亚硝酸钠 碳酸钠 碳酸钙 碳酸镁
MgNO3 Cu(NO3)2 Ca(NO3)2 NaNO3 Na2CO3 CaCO3 MgCO3
碳酸钾 （常见的盐）
K2CO3
氢氧化钠 氢氧化钙 氢氧化钡 氢氧化镁 氢氧化铜 氢氧化钾 氢氧化铝
NaOH Ca(OH)2 Ba(OH)2 Mg(OH)2 Cu(OH)2 KOH Al(OH)3
氢氧化铁 氢氧化亚铁（常见的碱）
Fe(OH)3 Fe(OH)2
甲烷 乙炔 甲醇 乙醇 乙酸 (常见有机物)
CH4 C2H2 CH3OH C2H5OH CH3COOH
碱式碳酸铜 石膏 熟石膏 明矾 绿矾
Cu2(OH)2CO3 CaSO4•2H2O 2 CaSO4•H2O KAl(SO4)2•12H2O FeSO4•7H2O
蓝矾 碳酸钠晶体 （常见结晶水合物）
CuSO4•5H2O Na2CO3•10H2O
尿素 硝酸铵 硫酸铵 碳酸氢铵 磷酸二氢钾 （常见化肥）
CO(NH2)2 NH4NO3 (NH4)2SO4 NH4HCO3 KH2PO4

I am a lovely girl. I am always ready to help others, so I often feel happy and get people's help in time when I am in trouble. My mother says that I'm very independent. I do what I can all the time b...

1.I'm not sure.She may be Australian.
2.I'm not sure.She may be Russian.
3.I'm not sure.they may be Chinese.
4 I'm not sure.They may have been bakers
5 I'm not sure.She may have been a doctor
6.I'm not sure.Hhe may be the boss.
7.I'm not sure.She may be twenty-one.
8.
9.
10.I'm not sure.May be under fifty.
11.I'm not sure.it may be 16th today
12.
!这是你的家庭作业吗?

意思为“前四个”
the second four"第二组四个
如1 2 3 4 5 6 7 8 9 10 11 12十二数字
“the first four”就是指1 2 3 4
“the second four”就是指5 6 7 8
“the third four”就是指9 10 11 12

I=eye(眼睛) white=whigt(幽灵,妖怪)=wite(谴责) son=sun(太阳) pears=pairs(对)
另外再送楼主一份小礼物,更祝你的英语更上一层楼^_^:
1.see---sea 2.sun---son 3.by---buy 4.four---for 5.night--knight 6.no---know 7.right---write 8.aunt---aren't 9.been---bean 10.hour---our 11.heal---heel 12.band---banned 13.hear---here 14.bread---bred 15.piece---peace16.ceiling---sealing 17.I---eye18.vain---vein 19.wait---weight 20.flour---flower 21.site--sight22.check---cheque

哎,按照我的大学英语老师在课堂上面对同学喋喋不休的提问,她直接扔一句【学英语没有为什么】你背熟记熟就想了,我们就囧了.无语啦.静了.教室

这是条直线呀,很好画的,只要确定两点就可以了,
找出任意两个点.
通常取x=0时,y=0
x=1时,y=2
然后再建一个直角坐标系,找出两个点,连一条直线就可以了.

1.So am i.I'm hungry,too.
2.So did i.I met him,too.
3.So was i.I was at the church yesterday,too.
4.So do i.I like ice cream,too.
5.So can i.i can swim,too.
6.So am i.i'm a doctor,too.
好累啊,加分把!

525 W Santa Clara St
圣克拉拉 西街525号

CH2=CH2中的”=“是表示双键的意思,表示一个分子中的碳原子之间的作用力.
后边的”=“是在化学方程式中表示”生成“的意思

Q=C*m*t(t是相对变化温度,就是可降低的温度比如降低到室温,m是它的质量,C是比热,需要查下）Q就是能量

give sth.a go：试一试某物
give the army a go给部队演习/ 演示机会

1 tell me what you are writing
2 tell me what you are cooking
3 tell me what you are paining
4 tell me what you are playing

我怎么感觉答案是C啊.

正交矩阵每一行（列）n个元的平方和等于1,两个不同行（列）的对应元乘积之和等于0
上面第一行的平方和为大于1的数,所以不是正交矩阵
正交矩阵的行列式的值为1

//代表并联
根据并联计算公式，R1//R2=R1R2/(R1+R2)

归功与--的意思
该句译为 小儿麻痹症疫苗的发现归功与jonas Salk 博士.

Its tail is long.
Our classroom is big.

是叫你给这两个词加后缀,让他们变成名词
dependent
movement

f(x)=ax+(x+2)^(-1)
所以f'(x)=a+(-1)*(x+2)^(-2)*(x+2)'
=a-1/(x+2)²

when(used in queation)什么时候；何时等
where在哪里
which哪一个
what什么
who谁；什么人
how怎样；如何
about1.大概e.g I ‘m just about ready.(我就要准备好了）
2.关于 a book about flowers( 一本关于花的书）
其实about 的意思很多,但是基础知识的话这两个就差不多了.
it它 Did you see it?( 你看见它了吗?)
are =be how are you?）用于第二人(you)称和所有的复数(we,you,they)

(boy,burgers,beach)
The bog eats burgers at the beach.
另造三个：
1.(Chinese,cry,clinic)
The little Chinese boy cried at the clinic.
2.(Bob,blow ,balloon)
Bob is blowing up a red balloon.
3.(Sam, shot, sheep)
Sam shot at the sheep.

lg2*lg50=(lg10-lg5)*(lg10+lg5)=lg10^2-lg5^2=1-lg5^2

function y=f(x)
y=zeros(size(x));
[m n]=size(x);
for a=1:m
for b=1:n
if x(a,b)

1.but that street is cleaner
it is the cleanest street i have ever seen
2.but that man is older
he is the oldest man i have ever seen
3.but that river is longer
it is the longest river i have ever seen
4.but that woman is shorter
she is the shortest woman i have ever seen
5.but that knife is blunter
it is the bluntest knife i have ever seen
6.but that car is cheaper
it is the cheapest car i have ever seen

1.He told me he was busy
2.They told me she was leaving
3.she told me they were joking
4.he told me tom was waiting
应该是这样回答吧?
你的一二貌似都一样＝ ＝

1 painted last month
2 three people injured in the accident
3 my bicycle was stolen a few days ago
4 when did this bridge build?
5 did you invited to the party last week?
6 how did these windows breake?
7 i didn't wake up by the noise

H应该是+1吧---------是元素的原子结构中最外层电子-------4易得电子是负价.=8是相对稳定结构---------H的最外层是1,易失1个电子,显正价------所以是+1

#include
using namespace std;
int q(int n,int m) //n个正整数的小于m的划分个数
{
if(n

12x3=10^12x10^3=10^15
2x5=10^2x10^5=10^7

有关函数题目的思路:1.单调性
2.对称性
3.特殊值
4.奇偶性
5.……
用上题说明：
1.二次函数f(x)应该首先想到设：f(x) = ax^2 + bx + c (a不等于0)
2.看到这题已知条件,应该发现特殊值：f(2)=0 ( 这里可以假设f(x) = ax(x-2),由于f(0)=f(2)=0),f(x)=2x 有一根为x=0(由于f(0)=0)
3.其次可以发现由于：f(x-1)=f(3-x),所以f(x)关于[(x-1) + (3-x)]/2 = 1对称（即f(x)关于x=1对称）.
对称这点从2也可看出,则现在可以重新假设f(x) = a(x-1)^2 + c
f(0) = a * 1 + c = 0 => c = -a,
所以：f(x) = a(x-1)^2 - a = ax(x-2)即在2中的假设.
4.方程f(x)=2x有等根,即 ax(x-2) = 2x => a = -1
说明：ax(x-2) = 2x => x(ax-2a-2) = 0有等根,即2a+2 = 0
所以f(x)=-x(x-2)
5.第二问首先假设存在,即当 m

这句话是陈述语序,I really have no idea about it,只不过这句句子中it 指代 what is the matter with my sister.

1.I'm not hungry.
Neither am I.I'm not hungry,either.
2.I didn't meet him.
Neither did I.I didn't meet him,either.
3.I wasn't at church yesterday.
Neither was I.I wasn't at church yesterday,either.
4.I don't like ice cream.
Neither do I.I don't like ice cream,either.
5.I can't swim.
Neither can I.I can't swim,either.
6.I'm not a doctor.
Neither am I.I'm not a doctor,either.

没有先行词,因为不是定于从句
把原句还原This factory is ____some foreign friends visited last Friday.
少表语,是表语从句,只能用A
定语从句
（序）
1 定语可以由形容词,名词,代词,数词,分词,副词,不定式以及介词短语来担任,也可以由一个句子来担任．
定语从句是由关系代词或关系副词引导的从句,其作用是作定语修饰主句的某个名词性成分,相当于形容词,所以又称为形容词性从句．
2 定语从句用来修饰名词,代词或整个主句．
3 定语从句分为限定性和非限定性从句两种.
4 定语从句存在的条件:先行词+关系词（有的版本作关联词）+从句
（一） 限定性定语从句
1. that即可代表事物也可代表人,which代表事物；它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词,which在从句中作宾语则不能省略.而且,如果which在从句中作“不及物动词＋介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的则放在它原来的位置
2. which作宾语时,根据先行词与定语从句之间的语义关系,先行词与which之间的介词不能丢
3. 代表物时多用which,但在带有下列词的句子中用that而不用which,这些词包括all, anything, much等,这时的that常被省略
4. who和whom引导的从句用来修饰人,分别作从句中的主语和宾语,whom作宾语时,要注意它可以作动词的宾语也可以作介词的宾语
5. where是关系副词,用来表示地点的定语从句
6. when引导定语从句表示时间〔注〕值得一提的是,表示时间“time"一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导
By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to business trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc.
7. whose是关系代词,修饰名词作定语,相当于所修饰成分的前置所有格
8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时,常用there is来引导
（二）非限定性定语从句
非限定性定语从句的作用是对所修饰的成分作进一步说明,通常是引导词和先行词之间用逗号隔开,将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分
2. 在引导限定性定语从句时,that有时相当于in which, at which, for which或at which
Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed.
人们对白日做梦的态度正在改变,这与人们对夜间做梦的看法的变化有非常相似之处.
I like the music for the very reason that(for which) he dislike it.
我出于某种原因喜欢这种音乐,而他恰恰与我相反.
We arrived the day that(on which) they left.
刚好我们到的那天他们走了.
3. 有时as也可用作关系代词
4. 在非限定性定语从句中,不能用that,而用who, whom代表人,用which代表事物.
（三）定语从句及相关术语
1.定语从句：修饰一个名词或代词的从句称为定语从句,一般紧跟在它所修饰的先行词后面.2.关系词：引导定语从句的关联词成为关系词关系词有关系代词和关系副词.关系代词有that, which, who, whom, whose, as等；关系副词有where, when, why等.关系词常有3个作用：1,引导定语从句.2,代替先行词.3,在定语从句中担当一个成分.
（四）关系代词引导的定语从句
1.who指人,在从句中做主语
(1) The boys who are playing football are from Class One.
(2) Yesterday I helped an old man who lost his way.
2. whom指人,在定语从句中充当宾语,常可省略.
(1) Mr. Liu is the person (whom) you talked about on the bus.
(2) Mr. Ling is just the boy whom I want to see.
注意：关系代词whom在口语和非正式语体中常用who代替,可省略.
(3) The man who/whom you met just now is my friend
3.which指物,在定语从句中做主语或者宾语,做宾语时可省略
(1) Football is a game which is liked by most boys.
(2) This is the pen (which) he bought yesterday.
如果在从句中做宾语,就用whom或who.比如: He is the man whom/who I talk to.
如果是在从句中作主语就只能用who.比如: He is the man who has an English book.
4. that指人时,相当于who或者whom；指物时,相当于which.
在定语从句中做主语或者宾语,做宾语时可省略.
(5) The number of the people that/who come to visit the city each year rises one million.
(6) Where is the man that/whom I saw this morning?
5. whose通常指人,也可指物,在定语从句中做定语
(1) He has a friend whose father is a doctor.
(2) I once lived in a house whose roof has fallen in.whose指物时,常用以下结构来代替
(3) The classroom whose door is broken will soon be repaired.
(4) The classroom the door of which is broken will soon be repaired.
(5) Do you like the book whose cover is yellow?
(6) Do you like the book the color of which is yellow?
（五）注意
介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时
从句常由介词+关系代词引导
(1) The school (that/which) he once studied in is very famous.
(2) The school in which he once studied is very famous.
(3) Tomorrow I will bring here a magazine (that/which) you asked for.
(4) Tomorrow I will bring here a magazine for which you asked.
(5) We’ll go to hear the famous singer (whom/that/who) we have often talked about.
(6) We’ll go to hear the famous singer about whom we have often talked.
注意：1. 含有介词的动词短语一般不拆开使用,如：look for, look after, take care of等
(1) This is the watch which/that I am looking for. (T)
(2) This is the watch for which I am looking. (F)
2. 若介词放在关系代词前,关系代词指人时用whom,不可用who或者that；指物时用which,不能用that；关系代词是所有格时用whose
(1) The man with whom you talked is my friend. (T)
(2) The man who/that you talked with is my friend. (F)
(3) The plane in which we flew to Canada is very comfortable. (T)
(4) The plane in that we flew in to Canada is very comfortable. (F)
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词
(1) He loved his parents deeply, both of whom are very kind to him.
(2) In the basket there are quite many apples, some of which have gone bad.
(3) There are forty students in our class in all, most of whom are from big cities.
（六）关系副词引导的定语从句
1. when指时间,在定语从句中做时间状语
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.2. where指地点,在定语从句中做地点状语
(1) Shanghai is the city where I was born.
(2) The house where I lived ten years ago has been pulled down.
3. why指原因,在定语从句中做原因状语
(1) Please tell me the reason why you missed the plane.
(2) I don’t know the reason why he looks unhappy today.
注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换
(1) The reason why/ for which he refused the invitation is not clear,
(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.
(3) Great changes have taken place in the city in which./where I was born.
（七）判断关系代词与关系副词
方法一： 用关系代词,还是关系副词完全取决于从句中的谓语动词.及物动词后面无宾语,就必须要求用关系代词；而不及物动词则要求用关系副词.例如：
This is the mountain village where I stayed last year.
I'll never forget the days when I worked together with you.
判断改错（注：先显示题,再显示答案,横线；用不同的颜色表示出.）
（错） This is the mountain village where I visited last year.
（错） I will never forget the days when I spent in the countryside.
（对） This is the mountain village (which) I visited last year.
（对） I'll never forget the days (which) I spent in the countryside.
习惯上总把表地点或时间的名词与关系副词 where, when联系在一起.此两题错在关系词的误用上.
方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状),也能正确选择出关系代词/关系副词.例1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one答案：
例1 D,例2 A
例1变为肯定句： This museum is ___ you visited a few days ago.例2变为肯定句： This is the museum ___ the exhibition was held.
在句1中,所缺部分为宾语,而where, that, on which都不能起到宾语的作用,只有the one既做了主句的表语,又可做从句的宾语,可以省略关系代词,所以应选D.
而句2中, 主、谓、宾俱全,从句部分为句子的状语表地点,既可用副词where,又因 in the museum词组,可用介词in + which 引导地点状语.而此题中,介词on 用的不对,所以选A.
关系词的选择依据在从句中所做的成分,先行词在从句中做主、定、宾语时,选择关系代词 (who, whom, that, which, whose)；
先行词在从句中做状语时,应选择关系副词 ( where 地点状语,when 时间状语,why 原因状语) .
（八）介词+关系词
1）介词后面的关系词不能省略.
2）that前不能有介词.
3） 某些在从句中充当时间,地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换. This is the house in which I lived two years ago.
This is the house where I lived two years ago.
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
（十）先行词和关系词二合一
1)Whoever spits in public will be punished here. (Whoever 可以用 anyone who 代替) 2)The parents will use what they have to send their son to technical school. (what 可以用all that代替)
（十一as） which 非限定性定语从句
由as, which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that.As一般放在句首,which在句中.
As we know, smoking is harmful to one's health.
The sun heats the earth, which is very important to us.
典型例题
1）Alice received an invitation from her boss, ___came as a surprise.
A. it B. that C. which D. he
答案C. 此为非限定性从句,不能用 that修饰,而用which.,it 和he 都使后句成为句子,两个独立的句子不能单以逗号连接.况且选he句意不通.
2）The weather turned out to be very good, ___ was more than we could expect.
A. what B. which C. that D. it
答案B.
which可代替句子,用于非限定性定语从句,而what不可.That 不能用于非限定性定语从句,it不为连词,使由逗号连接的两个句子并在一起在英语语法上行不通.
3）It rained hard yesterday, ____ prevented me from going to the park..
A. that B. which C. as D. it
答案B.
as 和which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语.但不同之处主要有两点：
(1） as 引导的定语从句可置于句首,而which不可.
(2） as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词；若为行为动词,则从句中的关系代词只能用which..
在本题中,prevent由于是行为动词,所以正确选项应为B.
As 的用法例
1. the same… as；such…as 中的as 是一种固定结构, 和……一样…….
I have got into the same trouble as he (has).
例2. as可引导非限制性从句,常带有'正如'.
As we know, smoking is harmful to one's health.
As is know, smoking is harmful to one's health.
As是关系代词.例1中的as作know的宾语；
例2中,它充当从句的主语,谓语动词know要用被动式.
（十二）关系代词that 的用法
(1)不用that的情况
(a) 在引导非限定性定语从句时.
(错)The tree, that is four hundred years old, Is very famous here.
(b) 介词后不能用.
We depend on the land from which we get our food.
We depend on the land that/which we get our food from.
(2) 只能用that作为定语从句的关系代词的情况
(a) 在there be 句型中,只用that,不用which.
(b) 在不定代词,如：anything, nothing, the one, all, much, few, any, little等作先行词时,只用that,不用which.
(c) 先行词有the only, the very,the same,the last,just修饰时,只用that.
(d) 先行词为序数词、数词、形容词最高级时,只用that..
(e) 先行词既有人,又有物时.
(f) 先行词指物,在主句中作表语时．
(g) 为了避免重复．
(h)先行词是the way时
举例：
Is this the book that you borrowed in the library?
这是你在图书馆借的那本书吗?
Who that break the window should be punished．
谁打碎了窗户都要受到惩罚．
All that is needed is a supply of oil.
所需的只是供油问题.
Finally, the thief handed everything that he had stolen to the police.
那贼最终把偷的全部东西交给了警察.
（十三）难点分析
（一）限制性定语从句只能用that的几种情况
1．当先行词是anything, everything, nothing (something 除外), few, all, none, little, some等代词时,或者是由every, any, all, some, no, little, few, much等修饰时
(1) Have you taken down everything that Mr. Li has said?
(2) There seems to be nothing that seems impossible for him in the world.
(3) All that can be done has been done.
(4) There is little that I can do for you.
注意：当先行词指人时,偶尔也可以用who
(4) Any man that/.who has a sense of duty won’t do such a thing.
2. 当先行词被序数词修饰
(1) The first place that they visited in London was the Big Ben.
3. 当先行词被形容词最高级修饰时
(1) This is the best film that I have seen.
4. 当形容词被the very, the only 修饰时
(1) This is the very good dictionary that I want to buy,
(2) After the fire in his house, the old car is the only thing that he owned.
当先行词指人时,偶尔也可以用who
(3) Wang Hua is the only person in our school who will attend the meeting?
5. 当先行词前面有who, which等疑问代词时
(1) Who is the man that is standing there?
(2) Which is the T-shirt that fits me most?
6. 当先行词既有人,也有动物或者物体时
(1) Can you remember the scientist and his theory that we have learned?
（二）关系代词as和which引导的定语从句as和which引导非限制性定语从句,有相同之处也有不同之处.具体情况是：
1．As和which都可以在定语从句中做主语或者宾语,代表前面整个句子.
(1) He married her, as/which was natural.
(2) He was honest, as/which we can see.
2. as 引导非限制性定语从句,可放在主句之前,或者主句之后,甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后.另外,as有“正如……,正像……”的意思
(1) As is known to all, China is a developing country.
(2) He is from the south, as we can see from his accent.
(3) John, as you know, is a famous writer.
(4) He has been to Paris more than several times, which I don’t believe.
注意：当主句和从句存在逻辑上的因果关系时,常用which
(5) Tom was always late for school, which made his teacher angry.
3. 当先行次受such, the same修饰时,常用as
(1) I have never heard such a story as he tells.
(2) He is not such a fool as he looks.
(3) This is the same book as I lost last week.
注意：当先行词由the same修饰时,偶尔也用that引导定语从句,但是和由as所引导的定语从句意思不同
(4) She wore the same dress that she wore at Mary’s wedding.
她穿着她在MARY婚礼上穿过的一条裙子.
(5) She wore the same dress as her young sister wore. 她穿着和她妹妹所穿的一样的裙子.
(三）以the way为先行词的定语从句通常由in which, that引导,而且通常可以省略.
(1) The way in which/ that/./ he answered the question was surprising.
(四) but有时也可以做关系词引导定语从句
(1) There are very few but understand his idea.
( but= who don’t )
(五) 区分定语从句和同位语从句
1．定语从句修饰先行词,它和先行词是修饰关系；
同位语从句说明先行词的具体内容,是补充说明的关系
(1) The plane that has just taken off is for London. 定语从句
(2) The fact that he has been dead is clear. 同位语从句
2．定语从句由关系代词或者关系副词引导,关系词在句中充当成分,有时可以省略；
同位语从句主要由that引导,在句中一般不做成分；
句子也可以由when, where, how, why, whether, what等词引导,充当成分
(1) The news he told me is true.
(2) The news that he has just died is true.
(3) The problem that we are facing now is how we can collect so much money. 定语
(4) The problem how we can collect so much money is difficult to solve.
3. 同位语从句和先行词一般可以用be动词发展成一个完整的句子,而定语从句不可以
(1) The idea that we could ask the teacher for advice is wonderful. 同位语
(2) The idea was that we could ask the teacher for advice.
(3) The fact that the earth moves around the earth is known to all.
(4) The fact is that the earth moves around the earth.

小同学：
加减法时,小数点对齐,和整数一样的加减运算,小数点位置不变.
乘法：按整数乘完,数一数相乘的两个数的小数共有几位,如1.2 X1.23共有3位,将乘完的数从最低位数,小数点放在这几位数之前就行了.
如1.2 X 1.23 ＝ 1.476
1位小数 两位小数 3位小数
除法：
还是问问老师吧

这个...such as后面跟的只能是名词,不能跟句子啊.跟句子的话得用for example.

第一步写化学方程式,你写对了.
第二步拆化学式,　你拆错了,NaCl是强电解质,要拆成离子的形式,应该是H+　 + 　cl-　 +　 Na+　 +OH- = 　Na+ 　+ 　cl-　 +　H2O．
第三步,删,删化学方程式两边相同的离子,把两边的　cl-　和　 Na+　删掉,剩下　H+　 +　OH-　＝　H2O
第四步,查,检查方程式两边原子是否守恒,电荷是否守恒,把化学式或离子前面的计量数化为最简.
所以这个化学方程式改为离子方程式应为：H+　 +　OH-　＝　H2O.
你主要出错在第二步,不懂怎么拆.一般：强电解质的要拆成离子形式,包括“强酸、强碱、可溶性的盐”（当然很多不可溶性的盐也是强电解质,但是它们不可溶,比如硫酸钡,碳酸钙,所以要保持化学式）,弱电解质（比如水,弱碱、弱酸）和难溶性的物质（比如碳酸钙、硫酸钡）,单质（比如铝）,氧化物（比如氧化铜）、气体（比如氢气、二氧化碳）要保持原来的化学式,不可拆.
编辑了那么多,希望对你有帮助,同时也希望你能采纳!谢谢

给你推荐的第一：席慕容的《青春》（百度百科上有,你输入青春便可）
第二：塞缪尔·厄尔曼 的作品,以下是翻译过来的,你可以找一下英文原文,很励志!
青春不是年华,而是心境：青春不是单单指年龄上的,而是一种生活态度,心里态度
青春不是桃面、丹唇、柔膝：青春不仅仅是指外貌上的俊美,面若桃花的美丽,朱红的嘴唇,柔美的线条
而是深沉的意志、恢宏的想象、炽热的感情：而是精神世界里的坚定信念,有无限广大的理想,敢爱敢恨的情操
青春是生命的深泉在涌流；如果把生命看做由水组成的各种形态,那么青春就是地下那一汪深深的泉水在涌动,是有无限力量的一种美

SAY USD DOLLARS ONE MILLION ONE HUNDRED AND NINETY EIGHT THOUSAND SIX HUNDRED AND EIGHTY CENTS TWENTY NINE

谓语动词为同一类的不加,不为同类的加

放飞
fàngfēi
1.允许飞机起飞.
2.放走飞鸟.
现在多比喻任由思绪等驰骋、任意想象.
个人理解

逐步,一点一点的意思.
Our product will be updated quarter by quarter应该是“我们的产品将会逐步更新”的意思.