在球心为O,半径为a,电荷体密度为的均匀带电球体内偏心挖去一个半径为b的小球，试证空心小球内存在均匀

英文的春梦怎么翻译?katy perry有首歌叫teenage dream能否翻译成春梦? Every young man is entitled to have a dream for his life的中文意思是? he had a duty to give this young man a lecture on the i______ of diligence and hard work The house which he bought in 1999,_____he sold two years later,is again on the market.A and thatB whichC and whichD when 请说明原因为什么不能理解为是非限 用 which？如果是限制性定语从句，为什么不用A? puma at large什么意思,怎么翻译?at large有“在逃”的意思吗？是个固定的短语吗？能不能解释一下，我没有字典啊 a puma at large求新概念英语3第一课“A puma at large” 的MP3格式的 A puma at large的疑问新概念第三册的第一课题目是 'A puma at large',为什么不是 'A puma is at large'?课文的最后写的是 ...a puma is still at large.还是题目是A puma (which is) at large的省略? 有谁知道A puma at large在英语新概念三册的第几课? 新概念3第一课puma at a large课后的多项选择题中的结构题（新版的是17页）___________________it immediately ran away.a) Observing her b)On being observedc)Having been observed d) On her being observed选什么呢 原因? the tall and strong boy is from america,找出4个同义句,急 ______and short of breath,Andy and Ruby were the first to reach the top of Mount Tai,语法高手进来选项有两个我在徘徊：A:Tired B:Being tired答案是A：Tired为什么我不能说成是：Andy and Ruby were the first to reach They bought a nice house in 1996.Years later,they bought a second house.second 前面为什么填a.求详细解释这个不定冠词 I bought the house 10 years ago改为间接引语 little water这个英语的音标和large pot的音标是什么 English has a large vocabulary,反义疑问A.hasn't it?B.doesn't it?理由 your,what,s,favourite,season是什么意思 水上飞机有哪些作用 "I bought the house 10 years ago"he says.He says that he ( )bought the house 10 years ( ).后面那句是变前面那句的间接引语 空格里填什么. 英语翻译These days when we say goodnight We're lying facing our own side Wondering if we're in the right bed.We've gotten used to all the fighting I walk out,you start crying And neither one of us knows what we said.But all that's gonna change fr 英语单选Mo Yan won the 2012 Nobel prize for Literature.He is the first Chinese to win the prizeMo Yan won the 2012 Nobel prize for Literature.He is the first Chinese to win the prizeA congratulations B well done C Iam glad to hear that D really I always play games with my father.划线提问,划了always._____________ ____________ do you play games with your father? a nice sweater中文意思 将这句话直接引语变为间接引语..."i bought the house 10 years ago,"he said."i bought the house 10 years ago,"he said.he said that he _______ bought the house 10 years ______.不应该是 had 为什么是had bought 英语翻译word used by highly intelligent people to replace a wide range of words and emotions andy什么意思 阿杜《Andy》这首歌的歌名是什么意思? 英语翻译用“determine”做 andy是什么意思啊／ 华罗庚回国将放弃什么? ANDY 是什么意思? 华罗庚教授应用数学助手组是什么 Who is that woman{ }whiteAat Bin Con