题目:
— How are you managing to do your work without an assistant?
— Well, I _____ somehow. [ ]
A. get along
B. come on
C. watch out
D. set off
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意可知,卷杨机重为m机g,被提升货物重为mg.设动滑轮重为G动,对卷扬机进行受力分析可知:F支=m机g+F拉,压力N=F支.对滑轮组进行受力分析,因绳重及滑轮的摩擦均可忽略不计,所以有:F拉=15(mg+G动)...