让我想了好久求帮忙 最好涂色1,明明在做实验时,需要将840毫升水分别倒入8个小杯和一个大杯中.如果倒入每个小杯里的水只

我认为先解决单词问题,如果条件允许去敏特英语试试,在电脑上背单词会觉得时间过的很快

1 无数个
2 |A/A|=1
3 |A/A|+|B/B|=2
4 3

充入氢气的体积＝2.7÷（1.29－0.09）＝2.25立方米
氢气的质量＝0.09×2.25＝0.2025千克

减去中间一圈,左边受力为A截面加上大气压力,右边仅为B处气压力.

无穷小(即无限趋近于零)
1/X 当X趋近于无穷大时取极限就可以了

爸爸,好久没见最近过得如何呢,韩国是落了很多红叶全街都发红的时期,虽然孤单的又短但因此更加美丽的季节.
Father,long time no see,how have you been?In South Korea,maple leaves fell,coloured the whole street in red,though lonely and short,yet this season is beautiful because of it.
这里没那么美丽,一些孤单和把心弄冰凉的寒冷蚕食掉我的灵魂,而且很悲伤地还得了忧郁症,虽然现在都好了,不过当时是受到使人发疯的头痛和晚上没法入眠分不出自我的状态下过了每一天.
It is not so beautiful here,with the cold hearted lonliness eating my soul.I was so saddened that I was depressed.Even though it is all good now,at that time I spend everyday with a headache that drove me crazy and sleepless nights that I can't even tell who I am.
变得很神经质,虽周围朋友多,但感觉他们的真心够不到我的某种感觉更加孤单,反而想要离远他们.在家每天听着lascia chio pianga留下眼泪,发呆着过了每一天,大约1个星期那么过了.但是时间是意味着变化,没人离脱时间的影响,我也自然而然娱乐变化,女朋友为了忧郁的我准备礼物,请我去吃我爱吃的海龙虾和resling等为我做了不少努力,精神上回复后最近还戒了烟（我比你先成功了）,我倒是解剖时间会看吸烟者的肺,看了后容易戒烟.
I became a little psychopathic,even surrounded by friends,I still feel like they are not sincere enough,and I became lonelier,trying to estrange them.Stayed at home,listening to Lascia Chio Pianga with teary eyes,dazed everyday,and before I realise,a week has passed thus.Thanks to my girlfriend who putted in a lot of efforts by preparing presents for the depressed me,and treating me to my favourite sea crayfish and resling,etc.After I regained spiritual equilibrium,I stopped smoking as well (got there before you).I sometimes look at the disected smokers' lungs,they helped me stop my addiction to smoking.
就像最近这样的时候想起跟爸爸一起去海边钓鱼的日子,那时候就为了多抓一只没赶上船,一晚上被关在岛里第二天早晨才出来的事情现在想都是好回忆,虽然累,不过快乐的时光,总有一天冬天一起去狩猎,我掉进到沼泽里头,什么都没猎成,就点个火煮个面吃的事情也现在想的话是个好回忆,虽然现在我在国外,能一起过的时间很少,但是你总在我的里面使我变化,我没能力判断,那是好还是坏,但肯定是好的,因为爸爸是伟大的人.悲伤的季节马上会过去会到来春天,悲伤的季节结束心跳的季节到来时我一定去找你,希望这段期间没有出任何问题过快乐的时间.
Recently,I keep thinking about those time spend with you at the sea,fishing.Back then,we would miss the boat trying to catch one more fish,and stranded on the island until the next morning,which even seemed like good times now.Even though tiresome,but was happy times.Even the time when we were going hunting in winter and I fell into the swamp,ending up no catch at all,and we sat around a fire eating boiled noodles seemed like good times now.Even though I am in a foreign country and not by yourside,the you inside of me still changes me.I could not tell whether this is good or bad,but I am sure this is good because you are a great man,father.After this sad season would come spring,when this season ends,I would go find you.Hope you spent a happy time without any problems.
最好的儿子.
Your best son,
-----------------
天上~

ormosia
你自己看看对不对.

把带有x的全部移到左边,不过移过去之后要变号,正号变成负号,负号变成正号.其他的数字移到右边,也要变号的.之后在左边提取公因式x,这道题就是（3-2）x=8-4,得到x=4,还有不懂的话再问吧、、

1000000

150度?油品使用寿命下降急速,用在什么设备上?
首先要查资料,知道三个参数:
40度运动粘度:30.5
100度运动粘度:5.9
密度:0.89
然后根据公式计算:
lglg(v1+0.6)=b+mlgT1 （式一）
lglg(v2+0.6)=b+mlgT2 （式二）
V1为40℃下的粘度,V2为100℃下的粘度,
T是绝对温度273.15K
代入算出常数b,m,
得到公式：lglg(v+0.6)=8.8267-3.46699lgT
根据此公式算出美孚624产品任何时的粘度.
故150时,运动粘度为2.75cst.
动力粘度=运动粘度X密度=2.75*0.89=2.4cp

坐在汽车上的人感觉汽车是静止的,路旁的树是向后运动的；
同时站在店面上的人感觉汽车是向前运动的,树是静止的.
可见物体例如汽车或树的运动与否,是相对的.
这个被当做不动的物体,叫做参照物.
以后再研究物体运动的时候,一定要声明参照物是那个物体.
一般我们经常选地面为参照物,但也有例外.

首先是这是一个概念的问题：第一宇宙速度（V1） 航天器沿地球表面作圆周运动时必须具备的速度,也叫----------环绕速度（或无动力助推情况下）.
火箭发射是靠推力上升的,他有个加速的过程,由于其发射目的（有的是发射地球卫星,有的是发射太阳卫星）和燃料的限制,他最终是一个环绕速度（向心力平衡与引力）固定在一个轨道运行不需要助推器.
如果火箭的推力大于等于阻力时以恒定10M/S竖直向上飞行,是可以脱离地球引力的.

众里寻他千百度,
蓦然回首,
那人却在灯火阑珊处.

2-r1,r3-2r1
1 2 -1
0 -4 1
0 -4 1
r1+(1/2)r2,r2*(-1/4),c2-2r1,c3+c1
1 0 0
0 1 -1/4
0 0 0
c3+4c2
1 0 0
0 1 0
0 0 0

因为可以互相线性表示的两组向量的秩必须相等.R1=R2,第一句是可以表出,所以有等号
第二句不能表出,所以要去掉等号,即
,R(b)>R(a)

是这样的,这三组放在一起kan ,不能分开看,应该合起来找规律.
给定第一行的四个数、第二行及第三行的第一个数,接下来的任何一个数=（上边的数×左边的数）÷ 3；
如下：
8=（4×6）/3
x=（6×8）/3=16
48=（9×16）/3
24=（8×9）/3
128=（16×24）/3
2048=（48×128）/3
如果满意的话请及时采纳和给予肯定,

这7个数的平均是77/7=11
所以,中间的数是11
所以,翻过的7天是8,9,10,11,12,13,14,

以下是英语思维方式翻译的：
Please don't ignore the things which seem small and unimportant to you.These things keep Mom very happy for a long time.Try to be thoughtful and let Mom see that that you love her.

1是对的,可令x=0,则有f(0-2)=f(-2)=-f(0)
因为f(x)在R上为奇函数,故f(x)=0,
即f(-2)=-f(2)=0
2是对的,由题可推出：f（x+2)=-f(x),而
f(x+4)=-f(x+2),故联立可得
f(x+4)=f(x),即f(x)的周期为4
4是对的,因为f(x)的周期为4,
所以f(x+2)=f(x+2-4)=f(x-2)=-f(x)=f(-x)
3是错的,因为若y＝f(x)的图象关于直线x＝0对称,即f(x)为偶函数即f(x),而f(x)是定义在R上的奇函数,则此函数只有y=0这一特殊情况,而题目中的函数指的是所有满足题目条件的函数,不一定恒为y=0这一情况.

帮你把 xia740675308 - 试用期 一级的话翻译一下,就是这样的：
原文：
Dear XXX：
Long time no see!
I'm very miss you!How are you?
I'm fine,and the day is easy to past.(开始介绍自己现在的生活,这就帮不了你写了.)
The best wish for you!I hope see you soon!
Yours:
XXX
翻译之后：
亲爱的三十：
很长一段时间没有看到!
我很想念你!
我很好,而且每天很容易过去.（开始介绍自己现在的生活,这就帮不了你写了.）
最好的祝愿你!我希望尽快看到你!
你：
三十

真正的意思在括号里.
也就是说是：一清二白,说明一个人没有什么可疑的地方.

?是指雨果问出版社他的文章是否通过,!指出版社对他的文章的高度评价,说明这本书十分的好.我现在初一,小学时我们也做过这题,答案差不多就是这样,自己组织下语言,希望对你有帮助!

1I haven't watched a movie for a long time.
2I haven't watched the movie for a long time.
3I haven't see the film for a long time.
4I haven't gone to the cinema for a long time
5I haven't been to the cinema for quite a long time.
6I haven't seen film for a long time.
7I haven't been to the cinema for a long time.

题目有点问题,应该是PQ交OA于点Q~这样可以证明出来.
令OA=OB=a,则AB=a√2
∠GPA=∠ORP
∠GPA=∠PGB+∠B
∠ORP=∠RPA+∠A
所以∠PGB=∠RPA
可以证明△PRA与△GPB相似
得出AR:PB=AP:GB
因为AP=BP
所以1/2a²=AR*OG+AR*a
a²=2AR*OG+2AR*a ①
因为三角形OGR是直角三角形,可以写出方程RG²=OR²+OG²
RG²=(a-AR)²+OG²
RG²=a²+AR-2aAR²+OG² ②
把①带入②
得RG²=2AR*OG+2aAR+AR²+OG²-2aAR
=AR²+2AR*OG+OG²
=(AR+OG)²
所以RG=AR+OG
证明完毕,有不明白的地方欢迎追问.
不要太好学了,早点休息,晚安!

嗯,如果是生物学一般的来说的核糖体合成部位就是核仁,因为这也是核仁存在的主要功能.而您疑惑的核糖体可能是大小亚基合在一起的那个核糖体,在细胞中的话一般是在翻译过程中才会出现那种情况的,而之前的那个一般是在...

这个就是x+1/x大于4,x＜1/3

他还记得这是生病的妈妈舍不得吃饭留给他的,而他,而他竟然弄丢了……泪水不断地从眼中溢出.“怎么办?怎么办?我对不起妈妈……”
这时,班主任走过来了,“怎么了?为什么还不去吃饭?哭什么?”他抬头看看,原来是班主任,想想班主任是那么严厉,小刚怕他怪自己忙低下头不敢看他说：“没,没什么……”老师问：“是不是把饭票弄丢了?”“……嗯”说着,小刚又无助地哭了起来.
“别哭了,来我这正好还有一张,拿去吧.”
“老师,我不要不要,我怎么能要您的呢?不要……”
“快拿着吧,不然要而肚子了……”老师笑着说.
“老师……”
“快去吧.”老师笑着拍了拍他的头走了.
小刚向着老师离去的方向深深地举了一个躬：“谢谢老师!”
多年之后,小刚成为了一名成功的商人.他总是在慈善会上将大量的钱捐给贫困地区的人民.在接受记者采访时,小刚深有感触地说：“我能做的便是尽自己最大的力去帮别人度过困境,将爱传递下去……”
（你也没有说写多少字……就写这些罢）

加几价的话,你们老师应该给过口诀.而且讲化学元素肯定要先讲原子结构图,只要看最外层有几个电子就行了.
配平的话,注意电荷守恒.每个人方法总不是一样的,多配配,就能摸出规律了.
不介意我问一下,你是初几啊?

定义域是x大于0
然后对f(x)求导得
f'(x) = lnx + x*(1/x)
令f'(x)大于0
解得 lnx > -1 x>1/e
所以(0,1/e)单调递减

1、大显身手
2、绞尽脑汁
望采纳,肯定对的

你没有错,不是原题错了就是没有答案

a：好久没见了,欢迎来到我的家乡,山东德州平原.
Haven't seen you for a long time.Welcome to my hometown,Dezhou plain,Shandong Province.
b：这里看起来很漂亮.
It looks so beautiful.
c：我同意,看起来经济发展也不错.
I agree,the economic development looks good as well.
a：前面就是我家乡的象征,三国文化广场.
Thanks,in the front is the symbol of my hometown,the Three Kingdoms Culture Square.
b：那我们快去看看吧.
Let's have a look.
a：走.
Let's go.
b：快看,如果我没猜错就是这里吧.
Look,it's here,If I did not guess wrong.
c：为什么叫“三国”文化广场呢?
Why is this square called the Three Kingdoms Culture Square?
a：这座广场是汉魏文化的见证,叙述了刘备坐平原的典故,有独特的三国文化色彩,以此而得名.
this square witnessed the culture from Han Dynasty to Wei Dynasty and narrated the allusion of Liu Bei assumed personal command in Pingyuan County.It has the unique color of the Three Kingdoms Culture.Therefore,it is so called.
d：“刘备”我知道,据说刘备被封为安喜县令,因不满都督而弃官出走,后作了县令.
Liu Bei,I know,it is said that he was made for the Anxi's county magistrate.Because of dissatisfaction with the military governor,he gave up his official position and left Anxi Count.Afterwards,he wes made for Pingyuan's county magistrate.
b：原来就是做了平原县令啊.
I see,he was made for Pingyuan's county magistrate.
a：嗯,对!我很佩服您知道这么多中国历史故事,跟我来,这就是桃园三结义的脸谱了.
Yeah,you're right.I admire you knowing so much about Chinese history.Please follow me—Here are the facial masks of Taoyuan Three Sworn Brothers.
c：哇,我看看,这是刘备?
Wow,let me have a look,is him Liu Bei?
b：不,这是张飞.
No,he is Zhang Fei.
d：这是关羽?
Is the person Guan Yu?
a：这是刘备,这是关羽,这是张飞.
This is Liu Bei,this is Guan Yu,and this is Zhang Fei.
c：原来我们都没猜对.
Hmm……all of us were not right.
bcd：哈哈哈.
Ahaha.
c：这个广场有多大?
How large is the square?
a：18万平方米.
180,000 square meters.
b：我们能在这照几张相吗?
Can we take photos here?
a：当然了.
Yes,of course.
d：那是什么?
What's that?
a：那是汉风牌楼,再现了汉魏时期的科技文化.
That's Han Dynasty Culture Memorial Archway,recurring science and culture during the period from Han Dynasty to Wei Dynasty.
c：这座广场真是太有意义了.
What a meaningful square!

2的n次方分之一

这个并列句子结构相同 后边一个就省略掉一些咯 避免重复冗余
To some smile is very easy,and to others (smile is) so hard.
We may go there by train or (by) air.
“省略”不仅是一种以无为有的表达方法,更是一种简便至极,虽无胜有的修辞手段.大文豪莎士比亚有句名言：Brevity is the soul of wit.意为：“言以简洁为贵”.

各有千秋 各有所长 各具特色

求人看稿说(斧正)
求人解答说(赐教 )
求人指点说(请教 )
托人办事说(拜托)
初次见面说( 久仰)
好久不见说(别来无恙 )
请人批评说(指点 )
求人原谅说(见谅 )
求人帮忙说(劳烦 )
求给方便说(劳驾 )

æ音在英音中才读成啊,尤其是现在的年轻英国人；美音中读成类似/e/的音,这种现象叫æ-tensing,澳大利亚英语中也有这个现象.
æ音在英音中,老式RP或年纪大的人都会读成类似美音/e/的音,但现在多数人都读成啊.美音保留了老式英音中æ音的这个特点,在东北部例如纽约,费城,还会进一度tensing成/eə/,例如daddy,就会读成/deədi/.
我也注意到字典中英音有些地方读成了啊,有些地方还是更像/e/,一是在前后有鼻音的情况,鼻音使元音鼻音化,变成nasalized vowel,例如tan,这种元音发音时都会有些升高（raising）,就是会从啊变成/e/；二是前后有k,g的情况,例如kat,tag,因为是软腭音,发音需要舌头后部抬起,会引起æ也跟着抬起（raising）,使发音顺利一些.这两方面的第二条是我自己总结的,还没找到语言著作的支持（最近太忙）,你如果有兴趣,也可以帮我多验证验证.和音标重读我倒觉得没有太多关系.任一年英语发音知识.

Being discussed over and over again,the problem still remained.或For a long time,the problem discussed repeatedly remains unresolved .

about 关于,附近,大约,周围,随身.
I have bought a book about Shakespearean.
我买了一本有关莎士比亚的书.
There are about fifteen trees in the picture.
图片里大约有十五棵树.
above 在.上,高出,以上,超过,在...上游.
The plane is flying above the clouds.
飞机在云上飞行.
I think the man is above sixty years old.
我想那人有六十多岁了.
across 横过,对面,交叉,在...的对面.
Can you swim across the river?
你能游过河吗?
We live across the street.
我们住在街的对面.
after 在...后面,依照.
He went home after school.
他放学后就回家了.
Read after me, please.
请跟我朗读.
against 撞到,靠着,反对,违背,
The car hit against the tree.
汽车撞了树.
He is standing against the wall.
他靠墙站着.
along 沿着,顺着.
They are walking along the river.
他们沿着河行走.
among 在...当中.
He is the tallest among them.
他是他们当中个子最高的.
around 在...的周围,在...那一边.
They sat around the table talking the news.
他们绕桌而坐谈论新闻.
There is a drugstore around the corner.
拐角处有一家药店.
as 作为.
He doesn't like people treat him as a child.
他不喜欢人们把他当小孩子对待.
at 在...时刻,在...点钟,在...岁时, 向,在...之中,按...速度,值(卖)...钱,
He always gets up at six in the morning.
他时常早上六点钟起床.
He shot at the bird but missed it.
他向鸟射击,但是没射中.
The car goes at eighty miles an hour.
汽车以每小时八十公里的速度行驶.
before 在...的前面(位置),在...之前(时间)
He took a picture before the car.
他在汽车前照了张照片.
He can't finish his work before supper.
晚饭前他完不成工作.
behind 在...的后面(位置), 落后于,不如,
迟于,晚于(时间)
Are there any brooms behind the door.
门后有扫帚吗?
All of us are behind him in mathematics.
我们数学都不如他.
below 在...之下,低于,
There are four lights below the ceiling.
天花板下面有四盏灯.
The murderer run away below the police's eyes.
杀人犯从警察眼皮底下跑了.
beside 在...的旁边,在...之外,与...相比.
He found the body by the river.
他在河边发现了尸体.
Beside yours, my computer is too slow.
与你的计算机速度相比,我的就慢多了.
besides 除...之外,
We are all here besides Bowe.
除鲍外,我们也都来了.
between 在...两者之间,
The relations between the two countries has improved since then.
两国的关系从那以后得到了改善.
beyond 在...那边,
The shop you are looking for is beyond the street, you can't miss it.
你要找的商店在街的那边,你不会找不到的.
but 除去.
He has nothing but money.
他除钱以外什么都没有.
by 被..., 在...的近旁 , 在...之前, 不迟于, 以...为手段.
The classroom was cleaned by the students.
教室由学生们打扫干净了.
Miss Lucy came to China by air.
露西小姐是乘飞机来中国的.
down 沿着...望下.
She walked down the street.
她沿着街道走.
during 在...期间,在...时候.
During the holiday, we went to the south.
我们假期去了南方.
except 除...之外.
He knows nothing except English.
他除英语以外什么都不知道.
for 为..., 因为..., 至于... .
He works for this company.
他为这家公司工作.
She came back to the classroom for she had left her books in the classroom.
她返回到教室是因为把书留在了那里.
from 从..., 来自..., 因为.
Where are you from?
你是哪里人?
He died from an accident.
他死于一场事故.
in 在..., 在...之内,从事于..., 按照..., 穿着.
He was born in 1992.
他生于1992年.
I could finish the program in two weeks.
我可以用两周时间完成这个项目.
He spend less time in reading.
他读书时间很少.
The man in black jacket is our teacher.
穿黑夹克的那个人是我们的老师.
like 象...,如同.
The twins are like their father.
双胞胎象他们的父亲.
near 靠近.
There are some flowers near the house.
房子附近有一些花.
of ...的,属于.
This is a map of China.
这是一张中国地图.
off 离开...,在...之外.
The young man got off the train quickly.
那个年青人很快下了火车.
I live in a village a little way off the main road.
我住在离大路不远的一个村庄里.
on 在...之上.
My book is on the table.
我的书在桌子上.
out of 从...出来,在...之外.
The dog run out of the house.
狗从房子里跑出来.
outside ... 外边.
They are waiting outside the gate.
他们在门外等着.
over 在...之上,遍于...之上,越过.
There is a light over the desk.
桌子上方有盏灯.
He is over sixty years old.
他有六十多岁.
past 越过...,过...,超越.
The students walked past the post office.
学生们走过了邮局.
It is ten past two.
现在是两点十分.
round 围着...,绕过...,在...周围.
We sat round the table.
我们围着桌子坐下.
The earth goes round the sun.
地球绕着太阳转.
since 自... 以后,自...以来.
He has made great progress in English since he came into the college.
从他来到大学后,他的英语有了很大进步.
through 经过...,穿过.
They went through the forest.
他们穿过了森林.
throughout 遍及...,在各处.
The police searched for the criminal throughout the mountain.
警察搜山寻找犯人.
till 直到...,在...以前.
He didn't come back till eleven o'clock.
他直到十一点钟才回来.
We'll be home till six.
六点以前我们都会在家.
to 到...,向...,趋于.
How long is it from here to the station?
从这儿到车站有多远?
under 在...之下,低于.
There are some footballs under the bed.
床底下有几颗足球.
These students are under seventeen years old.
这些学生们不到十七岁.
until 直到,在...以前,
Please wait for us until we come back.
请等着我们回来.
It was not until last week that I handed in mathematics paper.
直到上周,我才交了数学论文.
up 在...上面,在...上.
He went up the stairs.
他上了楼梯.
upon 在...之上,迫近.
It's not polite to look down upon him.
蔑视他是不礼貌的.
within 在...之内.
You must finish the work within two weeks.
你必须两周内完成这项工作.
without 没有,不,在...之外.
We can't do it better without your help.
没有你的帮助,我们就做不好.
We couldn't live without air and water.
没有空气和水,我们就不可能生存.
介词口诀：
自从以当为按照,由于对于为了到；和跟把比在关于,除了同对向往朝；
用在名词代词前,修饰动形要记牢.

两边取对数可以化简为3x^2-2x+3=0
解为（1±2√2i）/3

你看题里说共取三次,那么你可能拿到次品的可能的数量值就是0,1,2,3
这个,应该没有问题吧,也就是说X的可能取值为0,1,2,3
那么,题里说废品率是5%,也就是0.05,那就是说那到废品的概率是0.05,没拿到的是0.95
当X=0时,就是三次都没拿到废品,就是P0=0.95x0.95x0.95=
当X=1时,就是三次中拿到了一次废品,这时因为不一定是那次拿到的废品,所以你要用排列组合的知识C31,3是底数,1是上面的数,P1=C31x0.05x0.95x0.95=
同理,当X=2时,就应该是92=C32x0.05x0.05x0.95=
当X=3时,就该是P3=C33x0.05x0.05x0.05=
然后就列表就行,将X的每一个值与它所对应的P相乘,乘积相加,结果就是X的数学期望
至于方差的话,有用数学期望求方差的公式,你应该学过,我太久不碰了记不清了

2÷﹙2＋3﹚＝2/5
30÷﹙2/5－1/4﹚＝200页.

C表示组合方法,下标是总量,上标是选出的数量,C（下标X,上标Y）就表示从X个物体中选出Y个物体的组合方法的多少.
C（下标X,上标Y）＝C（下标X,上标C-Y）是正确的
比如C（3,1）=C（3,2）=3
理解其意义,就知道这样是正确的,C（3,1）表示从3个中选1个,很明显是=3
C（3,2）表示从3个中选2个,其实就跟选另外那1个的方法数相同,所以等于C（3,1）
有不懂的继续问撒

假设分解为一次和二次因式（当然,二次还要检查可否继续分解）；再展开,与原来的多项式恒等,从而对应项的系数相等,再分析求出-----------此法,待定系数法.
设x³-x²-18=(x+a)(x²+bx+c)=x³+(a+b)x²+(c+ab)x+ac
∴a+b=-1 c+ab=0 ac=-18
a*(-ab)=-a²b=-18 a²b=18
18分解质因数,18=3²×2
∴a=±3 b=2
∵a+b=-1
∴a=-3,b=2 c=-ab=6
∴x³-x²-18=(x-3)(x²+2x+6)

这个确实需要好久,视乎你希望深入到什么程度.
“中国又不重视这方面的人才培养”这句话是没有根据的.你的专业方向是自己选择的,既然你自己都没有选择自己的爱好,有什么理由埋怨国家呢?自学是个艰苦的过程,没有平和的心态是坚持不下来的.自我调整非常重要.
另外,“物理学”和“天文学”现在都已经分成了很多分支学科.比如物理学,光学、电学、磁学、电磁学、力学、粒子物理学、高能物理学甚至量子力学、场论、相对论等等都属于物理学的分支,在掌握了物理基础之后,选择分支是很重要的.天文学也一样,测量天文学、行星地理学、恒星天文学、河外天文学、天体物理学、高能天文学、红外、紫外、X射线天文学、宇宙学这些都属于天文学分支,方向选择同样重要.

梦中飞黄腾达.

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