题目:
It was____ John met his girlfriend______ he lost his wallet. [ ]
A. that; that
B. which; that
C. where; that
D .where; which
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A、A、B两物块置于同一圆盘上,且相对圆盘静止,具有相同的角速度,所以;错误B、由于,且,所以;错误C、向心加速度,由于,所以;正确D、向心力,虽然,但是,所以无法比较向心力大小;错误故...