题目内容

刚体是指在力的作用下,()和()保持不变的物体。

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根据构件的几何特征将构件分为()、板、块体、薄壁杆。

请你简述社会主义初级阶段路线的基本内容

I asked him whether he had done all the work himself ________ whether he had had any assistance.

A. and
B. but
C. nor
D. or

Either Mary ___ Lucy told him to come to see us.

A. or
B. and
C. with
D. nor

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