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【单选题】
刚性转子达到静平衡的条件是：A.
积之和为零
B.
积的矢量和为零
C.
受力平衡
D.
转子对机架不产生作用力
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【单选题】The couple did have a quarrel about money last night, but now they have already .
A.
taken up
B.
made up
C.
put up
D.
brought up
【单选题】They have already been to the place ____ their ancestors lived .
A.
which
B.
where
C.
when
【单选题】______ they have already solved the problem by themselves by now.
A.
Increasingly
B.
Invariably
C.
Presumably
D.
Dominantly
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