一平面简谐波沿x轴正方向传播,

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一平面简谐波沿x轴正方向传播,
理由Are you Tom?A.I am Tom B.I'm Tom理由 含数字“七”的词语,说说吧,请你们说5个以上的谢谢 带有数字七和八的词语 不溶于水的物质能溶于哪种溶剂?最好把化学方程式写上o(∩_∩)o... 有关于酒的诗句……不要整首诗 就要有酒的句子10个就可以 了有关于酒的诗句……不要整首诗 就要有酒的句子就可以 了 要 10句 诗的文化更是酒的文化 有关酒的诗句?要两条哦 11.[本题1分] According to the time table,the plane for Tokyo _______ at 9 in the morning.(A) has left (B) is leaving (C) leaves (D) left 12.[本题1分] When I arrived in London,it _______ (A) has rained (B) was raining (C) has been raining (D) ra 铜与醋反应的问题上次在家里用白醋除异味,结果发现所有的金属插头上都覆盖了一层绿色的物质.1)不知这成分是怎样的?2)具体如何反应?3)生成物有没有毒?4)该如何除去绿色物质? 醋与镁、铜的反应将镁条放入醋中,会产生气泡.放入铜丝,则镁为负极铜为正极,产生1.5伏的电.但不只是那些成分的反应. 乙醇与醋反应生成什么? 一句含有“秋”字的古诗 含有“秋”字的古诗有什么 带有秋字完整的古诗萌萌萌萌萌萌萌萌 红色硫化汞燃烧成二氧化硫和汞,研磨后成黑色硫化汞,隔绝空气加热变成红色硫化汞的文字表达式红色的硫化汞在空气中灼烧有汞生成,同时形成二氧化硫,汞和硫在一起研磨成黑色硫化汞,黑 黑色硫化汞隔绝空气加热变成红色的硫化汞晶体,是物理变化还是化学变化?、 描写冬天的古诗--要全诗求求了 描写秋季的古诗 快 我明天得交 我要全诗!快 有没有描写冬天的古诗?全诗! 几道英语选择题,麻烦帮帮忙.如下.1 [ ]There were __people in the street at midnight,so he drove fast.A a few B few C little D a little2 [ ]What did the man say over there?He told us __any further.There is danger ahead.A do not go B not go 酒醋合在一起会有什么反应 麻烦帮我看看选择题,英语的,错的很厉害, 请教酒精和醋的化学反应式好多年没学化学了,听说醋能解酒,请教下反应式作科学依据,别解酒反喝出病来.请问CH3COOCH3CH3是什么物质?有什么性质? 谁有描写秋天的诗?急!11 油与醋融合发生会发生什么化学反应? 1.-Ann is a doctor.-( )A.So is she B.So she is C.Neither is she 2.The price of that mobile phone is very ( )A.expensive B.high C.cheap3.They reduced the price( )1000 yuan a tonA.at B.to C.for4.I often saw this man ( ) with his dog in the dark last 麻烦帮我解决几道英语选择题1.what importance do you place on a good pud within_____,or a supermarket round the corner?A.food distance B.food distant C.walking distance D.walking distant2.word came _____our duties would be changed.A.that B 麻烦英语高手帮我解答一下下面几道选择题The old lady__for the door in the utter darkness.A.touched B.groped C.stretched D.extededA cup of water __my thirst after the long trip.A.quenched B.stimulated C.retained D.prohibited Lac mr smith would certainly have attended the meeting on time but his car______a flat tire halfway,A had had Bhad Chas had Dhas请问这是虚拟语气吗?不是虚拟语气是什么? 麻烦帮我解答与分析,1.They got much _____ from those new books.A.ideas B.photos C.news D.stories2.I have two _______ and three bottles of _________ here.A.orange,orange B.oranges,orangesC.oranges,orange D.orange,oranges3.Every evening M r.Kin 烧鱼时常加酒和醋,使食品更香,写出反应的方程式 ( ) the emperor saw was quite different from ( )the old minister told him.A.What,that B.That,what C.Which,that D.All,all(好诡异的题目)为什么捏? 英语选择题麻烦做一下?1.These cars are different _____ colours. A. in B. from C. at D. of2. Some of the food in the fridge ______ cheap. A. do B. likes C. to like D. does