单项选择题

The full utilization of berths can be achieved if（）.

A.ships arrive at random
B.cargo-handling time varies greatly
C.ships have to queue to get onto berths
D.ships do not have to wait to get onto berths

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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
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
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