（）不是中心回转体的组成部分。
A.旋转体
B.回转小齿轮
C.液压油道
D.水路通道
参考答案：B
What happened to businesses after the mass move().
A.They established branches in suburbs.
B.They scattered here and there in cities.
C.Some bigger companies moved out.
D.They lost many employees.
提出了“超越遏制”战略的美国总统是里根。
