椅式和船式谁更稳定

高一化学题 过程要详细 谢谢在一密闭容器中充入一定量的H2和N2,经测定反映开始后3s 末的 v(H2)=0.3 mol/(L·s),则3s 末NH3 的浓度为 （）A.0.45 mol/LB.0.6 mol/LC.0.9 mol/L D.1.2 mol/L过程越详细越好,谢谢了! 50ml 18mol/l 的硫酸中加入足量的铜片并加热,被还原的硫酸的物质的量是：A.等于0.9molB.大于0.45mol,小于0.9molC.等于0.45molD.小于0.45mol 请各位解决一下19和20题,急 求第19、20题答案 6-20题,英语大神来,快 15-20题,英语大神来,急 一个英语小问题 It is well established that mother does have an impact .中 does 是什么作用? 英语翻译The cooling process can take from a matter of minutes to a few hours,depending on the porosity of the coke bed and the quench water feed rate,with a process cycle time of the order of 15 h.Thermal strains imposed on the drums over a numbe 求英语大神帮我写一个英语简单对话话题分对话（Situational dialogue)和讨论（Discussion）两部分；对话每个话题每人十几句话就行,讨论的话就写一小段个人陈述观点的短文（说5分钟左右）就好. 就一题!英语! “一····就····· ”用英语怎么翻译 英语修改病句（就一题）They wasn't live here in 2003.(写出错误的地方并改正)注：我改成They weren't live here in 2003,但是是错误的. 一道高中英语竞赛的题目.求大神解释0~0Many people, if not most, _______ literary taste as an elegant accomplishment, by acquiring which they will complete themselves, and make themselves finally fit as members of a correct society. 一道牵涉到时态的英语竞赛题.求助大神解释~~It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.A.was made It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.A.was made B.would have been madeC.has been made D.had been made我 选 的 是 D.答 案 是 一道英文题求大神们解答..the students were all surrounding their teacher in the front of the classroom,___ their books in their hands. （ ）a. all off them heldb.all were holdingc.all of whom holdingd.all holding答案要 第五题英语 英语题第5题怎么做?为啥 22.__ABCD____ in mind as well as in body,the child needs more than medical care.A) Sick B) Be sick C) Because sick D) For sick23.To postpone _ABCD___ the debt will ruin our business reputation.A) paying B) to pay C) pay D) paid24.The milk smells _ABC 11 ．Wait a minute.__.A.I haven’t already locked the door B.I haven’t yet locked the door CA haven’t locked the door yet 12.This text is too difficult.I can’t understand＿． A.all B.at all C.above all 13．Only when you are 18 years old＿ 1 ．I don’t like the red shirt and I don’t like the green one__.A.,too B.neither C.either2.Sorry,I can’t see it__.A.clearly enough B.enough clearly C.very clear 3 ．Our teacher is ill today.That’s＿we have no class now.A.how B.why C.what4. 英语第5题 英语第五题 第5题用英文 英语五题 英语的题目第五题 好了,现在我要开始演讲了.我的题目是**** 求大神翻译成英语 哪里错了,英语 英语翻译 有好评. 谢谢英语大神 请英语大神帮助好评呢 英语翻译