单项选择题
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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Deck cranes require（） time to prepare for working cargo than derricks.
A.less
B.more
C.many
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单项选择题
The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.
A.a warp end
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Most anchor handling equipment incorporates （） for mooring purposes.
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C.bollard
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