单项选择题

The foreman says that the stevedores stopped working owing to the（）of the winch.

A.breakdown
B.breaked down
C.broken down
D.broke down

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单项选择题
The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.

A.decelerating when lowering the load
B.decelerating when raising the load
C.lowering the load at constant speed
D.raising the load at constant speed
单项选择题
The Chief Tally would like to inquire（）the rotation of the discharging ports.

A.at
B.on
C.about
D.after
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