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在t℃时,A物质的饱和溶液500g蒸发40g水.求析出无水晶体多少克(t℃时A的溶解度是20g) What do you usually do when it's( A rainB rainingC rainsD to raining选什么?顺便解释其余不能选的原因,或四个选项的区别! 初三化学溶解度的一道计算题.某同学在实验室发现一瓶标签残缺的溶液。为了测定此溶液的溶质质量分数，他取出了25g该溶液，向其中逐滴加入溶质质量分数为10%的NaOH溶液。反应过程中生 欧盟有几个成员国组成?同上、 欧洲联盟截至2010年共有几个成员国? 成员国 英语怎么说 求一篇英语作文：假如你是王彬,在外地工作的父母想了解你的学习情况 60词 --When did you hear the gunshot last night?---________ was at about 10 o’clock ________ I--When did you hear thegunshot last night?---________was at about 10 o’clock ________ I was just about to go to bed.A.It; when B.It; that C.That; when D.That 活是我们自己干的 用英语怎么说 《世说新语》两则课文是什么意思? 初中一年级语文的世说新语三则怎么翻译 小学生用英语介绍父母 语文第25课世说新语两则kuai ya wo ji ya 用英语介绍自己的父母要简短 用英语介绍父亲的工作（100字）doctor 好了 when did you last tidy your room 怎么回答? -Did you tidy your room?-No,I was going to tidy my room but I____visitors.A.hadB.haveC.have hadD.will have正确答案是： Do you often tidy your room? 第4题,可以用left away吗?第五题,when do you plan to tidy up your own room可以吗 Is that girl his sister?（作肯定回答） Is helen his grandmother?（作否定回答） that,his,biue,the,sister,girl,is,in,T-shirt组成一句话 Is that girl your sister?做否定回答 Is that his sister?肯定回答一.根据句意和汉语意思或首字母提示完成单词（1）Sally and Alice are my ____(舅妈）。（2）Your father is brother is your u_____。1.who is the girl in the p_____2.H_____ are two books for you， 人教版九年级英语第七单Section B的3b作文怎么写 英语:某人不再干某事 连词造句 who,the,is,girl,sitting,my,is,under,the,sister,tree 一首歌that girl is beautiful is so beautiful beautiful beautiful beautiful.一首英文歌很欢快 歌词好像是that girl is beautiful is so beautiful beautiful beautiful beautiful.,不是bob的nothing on you!也不是sean kinston的beautiful g Did you hear someone[ ] 【knock】 at the door when you[ ]【 watch】 TV last night.填什么,为什么 What did you hear last night?" "I seemed someone knock at the door."A hearB.to have heardC.to hearD.having heard "what did you hear last night?""I seemes____someone knock at the door".A.to hearB.hearC.having heardD.to have heard Did you hear someone knock at the door为何knock不加ing,(不是宾补,使役动词,表感官或心理状态的动词后的动词都变现在分词吗?) Do you hear someone knock at the door? 怎么理解?怎么全是现在时?错了吗?