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罐头制造过程中为什么要排气 真空包装食品是罐头工艺吗 排水法和排气法是什么?是干什么的?我才开始学化学,不懂,请指教. 化学上排气法怎么用啊向上排气法是集气瓶口向上还是向下? 罐头里有什么气体,为什么很难打开是利用的什么物理原理,压强还是? 为什么冰箱一般只冰塑料瓶子的而不冰玻璃瓶的饮料 为什么冰箱存放塑料瓶而不存放玻璃瓶- 为什么啤酒放在冰箱里冰冻会爆炸? 可乐和啤酒能放入冰箱冰冻吗?是冰冻不是保鲜.会破裂吗 装满水的玻璃瓶,放在冰箱内,当瓶中的水结成冰时,玻璃瓶回爆裂.其原因是什么?你们谁知道这个问题?知道就请讲吧/.. 英语翻译This museum was built ____great writer luxun..A in hope of B in favour of C in honour of D in addition of 英语翻译Poland and russia,which were still __ in 1920,have become good trade partners today.A.in war B.at war C.on peace D.in peace 英语翻译1.I don't like him,nor do I like( )he speaks.A.in the way B.the way C.what D.how2.When Jane began to take swimming lesson,her main ( )was the fear of water.A.evidence B.crisis C.obstacle D.danger3.John,a friend of mine ,who got married on 英语翻译the film pandamen –-–-––2030 when the world is under threat of two people who are trying to control people's minds A is set in B set in C sets in D is setting in 英语翻译he felt ____ that there must have been something unusual happening to his school.a very strong b so strong c very strongly d so strongly 英语翻译it is none of your business ___ other people think about you .believe yourself.a how b what c which d when 几道英语题（说明理由）Look!Do you know the boy who____next to your teather?A.who sits B.sits C.to sit D.sittingThe plates fit together l______a big puzzle,that is,somrthing difficult to understand or explain.(注：这是一篇讲板块与 aLL the president's men ______ one of the important books for historiand who study the watergate scandal.答案是remains.请问为什么要加s? Han Mei finds it very hard ________ English well.A.to learn B.learning C.learn ___wil you come back —In a week A How soon B How often C How far D How long 解释为什么选这个答案..举一些类似的例子 Faced with a bill for 10,000____.A.John has taken an extra jobB.The boss has given John an extra jobC.An extra job has been takenD.An extra job has been given to John 选择：1._you___he is able to ski,but I am.A.Both;and B.Not only but also C.Either;or D.Neither;nor 2.More than 70% of the Earth___covered with water.A.is B.are C.has D.have +++++分! 填空（1）他打算在六月的第一周出发.He____ ____ the first week in June.（2）他计划过一个轻松的假期.He____ ____ have a very relaxing vacation.（3）我等不及了.I____ ____!用所给词的适当形式填空.（1）I think Not only _____ to Canada ,but also he knows some Canadians.A he has been B has he been C he went D he has gone We can stay in Beijing only three days,so,let's_____the most of it and try to enjoy ourselves.A.take B.have C.get D.make 关于英语的一道题（要有明确解释,）----Can I help you ----sure ,I'd like ____ for cooking vegetables 1.two cups of tea 2.three pieces of bread 3.one bowl of dumpllings 4.five kilos of oil 选择I‘m good at ________,but Li Hua's good at _______.A.Chinese ,play computers B.Chinses ,to play computers.C.Chinese ,playing computers.2.It's very important _______ us to learn English well.A.to B.as C on D.for同一句转换.Math is not as di the new shopping mall will be located in ( ) used to be a wasteland and a huge garden will also be constructed ( ) there were numerous tombsA、where;where B、which;in which C、what; where D、which;where解释一下为什么D不对. He ofen sees the girl_____under the tree.A dance B dancing C dance Ddanced Wow!there are so many presents in the shop;I don't know_____to buy for my friend.A,what B,which但是为什么 — Is tea ready?— No,mother is ______ it ready now.A.doing B.cooking C.burning D.getting为什么选D而不选A The policeman watched a thief___ in to a building.A.go B.went C.to go D.A or B