已知F1，F2是双曲线C：x2/a2+y2/b2=1(a＞0，b＞0）的左右焦点，F1F2的绝对值=

copy 用音标怎么拼 48个音标,要正确的,能复制的!一定要书上的那种,最好不用/,帮一下忙.或者教一下怎么打也行. Every student knows that memory _____ learning a languageA plays a part in B takes part in C makes use of D gets along with negative plural verbs 和 singular verbs being verbs 是什么 工作环境用英语该怎么说? I see him on the street.(last week改写）并说明下 please wait for the flighe in the ____ _____. 请问攻和受是什么意思?如题 谢谢了就这些. 基础环境设施维护服务英语怎么翻译 5.What you should do first is to find out what make her 6.addicted to computer games.Lack of lovefrom 7.parents?Poor scores?Then having a heart-to-heart talk8.with her.Secondly..you should help her with his study to9.build up her confidence and make 英语翻译-----Is there anything interesting up there in heaven?----Well,I was just sending up a prayer of thanks.-----For what?-----For you forgetting to bring that harmonica.I’m enjoying the peace and quiet.中的第一句 at the ago of fourteen什么意思 He died at the ago of sixty.的同义句是什么 yes or no还有几部没拍啊? 貌似感冒了英文怎么说 人与小动物交流的一小段话就是写 一开始小动物害怕 后来慢慢的开始交流 后来完全相信了我 可以写 流浪狗呀 什么什么的 喂它东西吃呀 什么什么的马上用 有关小动物有趣真实的五个片段就是类似于《跑进家来的松鼠》那样有趣的片段.注意,要具体事例,并且不能太短. 写一小段话来描述一种小动物的某个特点. occasion,condition,situation,case前面的介词分别用什么? occasion和situation和condition怎么区别? 请问单词occasion、situation、condition有什么区别?同题.希望得到清楚的解答.恭祝新年快乐! 任意输入一个数,来判断其是否是素数.若为质数,显示yes,否则,显示no.快用C语言编程 请问今天（2011.7.30）的雅思阅读,有YES OR the story of the three little pig's has been passed down for many years意思是 the story happens for three years Did you hear of the story of 孙悟空?此处是否用hear of situation和Case都有都是名词都有情况的意思?怎么区分用法? 箜篌这个词怎么读啊?这个字是只读chou么?——缪 箜篌是什么乐器 读了冬不拉的故事,我泪流满面,热泪盈眶今天之内必回答 不然无效!