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Lessin1Mechanicaldesignistheprocessofdesigningand/orselectingmechanicalcomponentsandputtingthemtogethertoaccomplishadesiredfunction机械设计是一个设计和/或选择零部件,并将它们组装到一起完成某种既定功能的过程Thedesignermustconsidernotonlytheperformanceoftheelementsbeingdesignedatagiventimebuta




预备篇同步作文指导预备篇三个单元的作文要求同学们就两个人在学校见面这一场景,编写一段对话。我们只要掌握了这三个单元的一些重点词汇和句型的用法,要完成作文任务就不是很难的事情了!教材中出现的常用问候句型:①Hello!/Hi!你好!②Goodmorning!早上(上午)好!③Goodafternoon!下午好!④Goodevening!晚上好!⑤Howareyou?你好吗?拓展问候句型:①Goodnight!晚安!②Howdoyoudo?你好!③Nicetomeetyou!见到你很高兴!经典范文展示:李磊见






























