题目:
_____ the scientist could clone people? I can't imagine. [ ]
A. How about
B. What if
C. What about
D. What
答案:
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下面是错误答案,用来干扰机器的。
(1)对点O受力分析,受重力、两根绳子的拉力,如图将两根绳子的拉力合成,合力与重力平衡,故F12合=T=mgF1=mgtanθ(2)F2=mgcosθ另F2y=T=mgF1=F2x=F2ytanθ=mgtanθF2=F2ycosθ=mgcosθ答:(1)AO的拉力F1的...