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请问铜钝化后如何检测他的钝化效果,听说有什么耐腐蚀实验,还有什么结合力实验,那么什么输就最好呢? 如何提高镁合金的耐蚀性? 为什么镁合金耐腐蚀性差 请问使用酸洗膏及钝化膏对打磨过的304不锈钢表面进行钝化,耐腐蚀效果如何?物料中含有100ppm左右的CL-. 外星人用英语说出了alien还有什么单词 外星人 英文是Alien吗 外星人英语用 ET准确,还是Alien准确?要说出为什么. 英语作文 how to spend the Mid-auturn Day?中学生作文， how to spend our pocket money英语作文 How to spend money If my class now have 4000RMB ,what we should do to spend the money At least in 3 ways ...help me to think about How to spend ... There is no cat and no dog in the room.是不是肯定句? Tom sent me____ e-mail last night.A a B an C the 选哪一个 last night i sent some emails to my frieds.变为同义句 He sent an e-mail to me last week.转换为An e-mail— — —me last weekYou should water the flowers every day.转换The flowers— — every day how did kids spend the weekend 怎么读的 Ted said he saw UFO and alien that night.A.an,an B.a,a C.an,a D.a,an 讲下原因Ted said he saw UFO and alien that night.A.an,an B.a,a C.an,a D.a,an An alien got out of the UFO为什么用the UFO与它的全称前面是加 an还是a?UFO前面加a。那unidentified flying object按照发音特点。是加an么？ UFO前应该用an还是a 好像都有道理说明原因 legend of mermaidlegend of mermaid? ls there a cat behind the curtains 改为肯定句是什么? Is there a cat behind the curtains答句 is there a cat behind the curtains 答句 -Have you received my ________?-Yes.It reached me only twodays ago.A.answer letterB.answering letterC.reply letterD.letter in reply Have you received an e-mail message from Helen?----____________Really?no news is good newsA.YES,I have.B No,I haven't You have new mail!我在完型中看到这句话.mail不是可数名词吗?为什么这里you have new mail没有冠词 mail也没变复数? -Do you have msn?-Of course I have!Do you find I have added you My new mail is:这样回答是不是显得很没有礼貌?怎么中国式了呢？请你帮我改改！ 为什么佛教有万字而纳谇也是万字旗有什么联系 一袋氧气能吸多久 关于there is/there isn‘t和there are/there aren’t发音的区别我现在准备把听力好好搞一搞,在听北外的“中级英语听力”,我发现我很难听出来上述几个连读的情况,另外of基本听不出来,还有won't经常 地球上的氧气能够我们吸多久的?每人每天都吸入太多的氧气了! 用There is（isn't） 或 There are （aren't）填空A:Wow,we have so many things for dinner._____ any meat?B:Yes,_____._____ some chicken ,pork and beef,but _____ any fish.A:Good._____ any vegetables?B:Yes,_____ ._____ some potatoes,tomatoes and c