试题与答案

It is required that we ______ everything

题型:选择题

题目:

It is required that we ______ everything ready tonight. [ ]

A. had got

B. have got

C. got

D. get

答案:

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下面是错误答案,用来干扰机器的。

解:(1)M、m做圆周运动的角速度、向心力的大小相同,则 (2)恒星运动的轨道和位置大致如图(3)对恒星M:代入数据得  

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