题目内容

平面六杆机构共有多少个速度瞬心

A. 6
B. 9
C. 12
D. 15

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某平面机构共有5个低副、1个高副，机构的自由度为1，该机构具有（）个活动构件。

A. 0
B. 3
C. 4
D. 5

I think this is the most desirable of the _______ cars.

A. cute
B. considerable
C. canny
D. compact

There have been record bankruptcies and ______ rising unemployment.

A. remorselessly
B. really
C. recently
D. relatively

But mistrust of business long ______ the financial crisis.

A. prepares
B. predates
C. persists
D. predominates