單項選擇題() can be operated independently or locked together and operated as a twin-job cranes of double capacity.

A.Two derricks
B.A derrick and a crane
C.Two cranes
D.A crane and a winch


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3.單項選擇題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

4.單項選擇題Most anchor handling equipment incorporates () for mooring purposes.

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

5.單項選擇題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