边防军人的感人故事

为什么河流不是直的而是弯曲的 一道数学题,重点在于思路.已知正数a、b满足以下规律：√ab≤（a+b）÷2..根据此规律完成以下两题：①请问：什么条件下：√ab＝（a+b）÷2?②用20米的篱笆围成一个长方形羊圈,长宽各为多少 什么是广袤无垠 一道数学题,重点思路.已知正数a、b满足以下规律：√ab≤（a+b）÷2..根据此规律完成以下两题：①请问：什么条件下：√ab＝（a+b）÷2?②用20米的篱笆围成一个长方形羊圈,长宽各为多少米时 武松是什么样的人 把正方形的八个角切去一个角后,余下的图形有 几条棱? 初二英语句型转换:there is no use getting along with her..It's ___ ____ get along with her . chat 句型 a wide selection of的意思 A wide range of hypotheses implicating selection have been presented for the rapid emergence and di 一道交变电流题目的问题解析里说：线圈转过90°经过的时间为：△t=T/4为什么是T/4怎么理解? 哦字第四声怎么组词? 一条关于交变电流的问题一台发电机产生的正弦交变电流的电动势峰值是156V,线圈从中性面开始匀速转动,其角速度是120π rad/s,写出电动势的瞬时值表达式.在1s内电流方向改变多少次? 一个关于交变电流的问题?交变电流中什么时候用EmSINwt什么时候用EmCOSwt 一个交变电流的问题一个线框在一个匀强磁场中,与磁场垂直,这时候通过线框的磁通量不是最大的么?当它绕中间轴转动,转过90°时,磁通量变化率最大,产生的E也最大,我没说错吧,当它再转过90 英语：you will hear three pieces of recorded material 2 对于武松杀了那么多人怎么看 What material of English shold I read?As a superb English learner? offered 和 which offered的区别Circulation depends somewhat on the work of the circulation department and on the services or entertainment (offered) in a newspaper's pages.这里为什么不能用which offered? Can you see a z_______ in his telephone number.怎Can you see a z_______ in his telephone number. can you still remember his a____ or telephone numbershe is much b___ than when I wrote last Why need to tell you? Selection of Soldoros这句话什么意思 是个女的唱的,开头是when i see you looking at me .高潮有never tell me why why why(...)how to turn around say good bye bye bye(...)do cry cry cry(...)可能有单词写错了,但大概音就是这样的, 《山海关》第九自然段主要的表达方式是什么?写了怎样的内容?一分钟! The reservior in the hill____ water to the town.A.gave B.offered C.provided D.supplied我知道是对的.但是B不可以吗? A complete Selection of 武松杀了很多人你怎么看快 急 求 英文辩论稿the view that money brings greater freedombanning smoking in restaurants辩论题目是这两个 急求1篇英文反方辩论稿辩题是:to take care of our parents when they are old.偶想请问1下..反方该如何辩驳?最好就把观点罗列出来..万分感激! 英文辩论稿 高手帮下忙哈辩题是 appearance is important 正方观点最好有具体例子 广袤无垠的意思