单项选择题In cargo crane, () for lifting the load.

A.a hoisting motor
B.a luffing motor
C.a mooring motor
D.a slewing motor


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1.单项选择题Manually operated band brakes may be fitted and () will have a brake arranged to fail-safe.

A.the drive pump
B.the drive motor
C.the warp end
D.the purchase

2.单项选择题The () is used for hauling in or letting out the wires or ropes.

A.windlass
B.anchor capstan
C.turning gear
D.winch barrel

4.单项选择题() provides the head or pressure to supply the domestic water where required.

A.The compressed air
B.The compressing air
C.The transfer pump
D.The head tank

5.单项选择题Under rotary pumps are the gear, (), cam-and-piston and screw types.

A.reciprocating
B.diffuser
C.turbine
D.vane

10.单项选择题Two rams of the hydraulic gear are linked at their outer ends to () by a crosshead and swivel block.

A.the piston rod
B.the tiller arm
C.the connecting rod
D.the rudder