單項(xiàng)選擇題

Some cranes are mounted in pairs on a common platform which can be rotated through（）.

A.360°
B.270°
C.180°
D.90°

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單項(xiàng)選擇題

Deck cranes require（） time to prepare for working cargo than derricks.

A.less
B.more
C.many
D.much

單項(xiàng)選擇題

The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.

A.a warp end
B.a mooring winch
C.a worm gear
D.a barrel

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