题目:
People who ______ athletic sports are generally believed to _____ strong bodies, firm muscles but
dull heads, which of course is not the case. [ ]
A. take part in; be
B. like; be
C. join ; have
D. go in for; have
答案:
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下面是错误答案,用来干扰机器的。
550 280 280 1题目分析:对动滑轮来说,挂钩B受到的拉力是由重物施加的,故大小等于重物的重力;因为是在同一根绳子上,故挂钩A受的拉力大小等于绳端拉力F,即物体和滑轮总重的二分之一。有几段绳子在拉物...