什么是水利工程测量

我不好的英文怎么写 不好英文怎么写 已知正项数列{an},期前n项和sn满足10sn=an²+5an+6且a1,a3,a15成等比数列,则数列{an}的通项an=? 什么时候用过去进行时和过去式刚学过去进行时,可是不知道在什么时候用.经常和过去是混.3Q 以知正项数列{an},其前n项和Sn满足10Sn=an2+5an+6且a1,a3,a15成等比数列,求数列{an}的通项公an. 英语音标 j 发什么音?单词you [ju:]发音(由),我怎么感觉音标 j 无论怎么发音都拼拼不出(由)音来? ju英语发音为什么有时候发u?有的时候不读ju(you)而是读u（Wu）写的还是ju怎么区分?subdue录音最后u写着ju读u? 英语音标/ju/和/u/有区别吗如果说一个念“优”/ju:第二个念“乌”/u/。那么/tju:/可以读偷儿，而/tu:/可读成”兔“谢谢！ 这2个音标u：和ju：是不是一个音来的 读法一样student 这个是开音节吗 尾音明明是t 是闭音节吧 怎么读成ju：了 还有apple也是a不是读成A 有关海的 英文单词有哪些?谢谢了,大神帮忙啊例如SEA 等 突然忘了 I would have written before,but I （ ） ill.A.were B.had been C.would be D.was would have written?29.Who do you think would___the letter of congratulations to the teacher?A.have written B.have wroteC.have to write D.have writes答案给的A,would have written, If I had had time,I would have written to you.But in fact I___not.A.have B.would have C.had D.had had这里的两个had是什么意思? 如何利用英语口语提高英语听力水平 找一个有2个英文单词求大神帮助这2个英文单词要是个一个词语的缩写~这个词语必须有一定的气势或意蕴! Have you read the book called Waiting for Anya?—Who __it?(2008 北京卷 ) A.writes B.has written为什么不能用一般现在时,表客观真理答案用过去式wrote Have you read a book called Waiting for anya?-Who( )it选项 A writes B wrote C has written D had writtenD选项为什么不可以 写 不是在读 这个动作之前吗 怎么不可以用过去完成时呢? --Have you read a book called Waiting for Anya?--Have you read a book called Waiting for Anya?--Who _____ it?A.writes B.wrote但A不是表示一样常规的事么,一直都是存在的客观真理,书就是XX写的. Have you read the book called Waiting for Anya?—Who __it?(2008 北京卷 )答案选wrote,这又是为什么? ...—Have you read book called Waiting for Anya?...—Have you read book called Waiting for Anya?—Who _ it?A writes B has written C wrote D had written选择什么呢?是a还是c 26个英文字母用汉字怎么读 Have you written a letter to you mather ? I wrote _____ yesterday. 是填IT还是ONEHave you written a letter to you mather ?I wrote _____ yesterday. 是填IT还是ONE/ 英语翻译We received your letter today and have informed our customers of your situation.As requested,we have instructed the Beijing City Commercial Bank to extend the L/C up to and including September 30.Please keep us abreast of any new developm After i have ansered his telephone call,then i （ ）have wrote him a letter,括号里还用加have吗?原 Letter英文翻译 英语翻译：We received your letter today and have informed our customersWe received your letter today and have informed our customers of your situation. As requested, we have instructed the Beijing City Commercial Bank to extend the L/C up to and Who was the book( A.write B.wrote C.written D.written by by who was the book written The book ____ (write) by Bill Gates in 2002.是 is written 还是 was written who was the book weitten by?和whom was the book written by?有什么区别? 2014年元宵节是几号