单项选择题
Deck cranes require（） time to prepare for working cargo than derricks.
A.less
B.more
C.many
D.much
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相关考题
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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
B.a mooring winch
C.a worm gear
D.a barrel -
单项选择题
Most anchor handling equipment incorporates （） for mooring purposes.
A.cable lifters
B.spur wheels
C.bollard
D.warpends -
单项选择题
A variable displacement system of hydraulic drives consists of （）.
A.a variable displacement axial piston pump
B.a constant displacement axial piston pump
C.a reciprocating piston pump
D.a centrifugal pump
