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

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单项选择题

A.cable lifters
B.spur wheels
C.bollard
D.warpends

单项选择题

A.a variable displacement axial piston pump
B.a constant displacement axial piston pump
C.a reciprocating piston pump
D.a centrifugal pump

单项选择题

A.Constant pressure system
B.Variable pressure system
C.Variable displacement system
D.Constant volume system