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第一宇宙速度和第二宇宙速度各是多少? 第一宇宙速度和第二宇宙速度的关系第二宇宙速度是第一宇宙速度的根号2倍,是怎么算来的? 求一个含未知数的分式的最大值在一个分子分母都含未知数的分式中,求这个分式的最大值.例如（4-x^2)/(x+3）的最大值是多少?再例如：（1-R)/(R^2-3)的最大值是多少?我不知我说清楚没,我知道这 ．五(1)班的同学向贫困山区学生捐书,有捐两本书的,有捐三本书的,有捐四本书的.己知捐两本书的占全班的1/2,捐三本书的占全班的1/4,捐4本书的占全班的1/5,有几分之几的人没有参加捐书活动? 五年级下册数学期末试卷附加题 They elected nixon president 怎么是nixon president呀? They acclaimed him president翻译为他们鼓掌通过他为总统.怎么理解这句话 We elected him president中文是什么意思?译成中文的意思是什么 我要初中所有的离子符号一定要有 表达式我要初中所有的离子符号一定要有表达式一定我 要全部的 . 常见的 都要快 表达式是取所有标记,怎样写它的反向查找就是想取到标记以外的所有文本. They said they wanted to know ( )do to help us.A:what they can B:how they canC:how can they D:what 为什么不选B 怎么做也很通顺的.D what can they do After a long discussion they ____ to free a man( A agreed B hoped C wanted) 寻Close to You(They Long To Be)--Carpenters超级喜欢这首歌!电影《夕阳天使》插曲 莫文蔚有翻唱过这首和电影原声有点不同,电影原声更好听.有谁有原声带MP3,希望能发过来!谢谢不是莫文蔚翻唱的那 两种金属混合粉末15g,与足量的盐酸反应是生成11.2L氢气（标准状况）,符合上述情况的金属化合物的是( )两种金属混合粉末15g,与足量的盐酸反应是生成11.2L氢气（标准状况）,符合上述情况的 f(sin(-x))=-f(sinx)?为什么成立? 若f(x)=sinα-sinx,则f'(α)等于多少 氢气和氧气的混合气体共10g,在密闭容器中点火反应后,剩于气体为一克,则原混合气体的组成可能为? 以知f（1-sinx)=sin方x,求f(x) 如果f(x+π）=f(-x),且f(x)=f(-x),则f(x)可能是?sin2x或 cosx 或 sin[x]或 [sinx] f(sin^2x)=x/sinx 求f(x) – Who bought those toys,do you know?– Oh,they _____.They were the things we had made ourselves.A.hadn’t bought them B.didn’t buy them C.hadn’t been bought D.weren’t bought为什么?其中They were the things we had made ourselves.希望 last they agreed ___ the time to meetAt last they agreed ________ the time to meet.A.on B.to C.with D.for They spent as much time traveling as they_________.They spent as much time traveling as they_________.A.readingB.were readingC.did to readD.did reading急 高一英语必修一 题Einstein is one of the greatest scientists of -timesA new B ancient C old D modern Who would you rather( )as the captain of the team?Who would you rather( )as the captain of the team?--I've not decided yet.I'd preaf to listen to ypur opinion.A .have to act B have act C to have acted D.to have acting一定要讲一讲呀, 发射卫行的过程中为什么轨道在加速到大于第一宇宙速度时会变成椭圆的而不是直接变成圆的 求y=sinx*sin(x+60)的最大值 求y=sin(x-π/3)sinx最大值 y=sinx+sin(x-π/2 )的最大值是多少啊? y=sinx/2+sin(60-'x/2)的最大值.怎样做? 高一数学含绝对值的不等式A=｛x||x-1|＜|x-2|｝,B=｛||x-t|≤1／2｝,若集合B包含于集合A,求实数t的取值范围 2x+3y=2k-5,x-2y=-k+7 且x的值与2Y的值互为相反数,求k的值