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关于化学中的元素变价元素的化合价决定于元素的最外层电子数,最外层电子数又是一定的,那么元素的变价是怎么回事?不是化合价而是如Fe2+和Fe3+之类的同一元素的不同化合价! What can I do for you的同义句是 寻求关于How to spend the money的英语作文 He had a litltle trouble _his tires.A.to B.fixing C.fixed D.fix应该选哪个 A.fix B.fixing C.fixed D.to fixI fell down and broke three of my teeth.I wonder how many times I have to come here and get my false teeth_____. My father's bike is broken.My father is busy _ .A.to fix it up B.fixing it up C.fixing up it The radio doesn't work well,it need_________ A fixing Bbeing fixed C to fix D fixed为什么?need doing = need to be done可是这里是用的doing,但是不是被修理吗?为什么不选B呢? i _______(make) the decision to study aboard to study hard can help to make your wish ___(com) ture. what do you usually do on christmas?翻译 what do you usually do on christmas?Ai an going tto have a partyBi eat delicioua foodci bought some giftsdi like christmas very much what do you usually 前面的助动词do有什作用,如果换成第三人称,是什么样? How to spend a Nice Weekend英语作文 70词左右假设你们学校英语俱乐部即将举办一场以“How to Spend a Nice Weekend"为题的演讲大赛,请你根据下列内容提示,写出一篇演讲稿.提示：1.和父母一起看电影2. 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