A.cable lifters
B.spur wheels
C.bollard
D.warpends
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A.a variable displacement axial piston pump
B.a constant displacement axial piston pump
C.a reciprocating piston pump
D.a centrifugal pump
A.Constant pressure system
B.Variable pressure system
C.Variable displacement system
D.Constant volume system
A.in the pert position
B.in the starboard position
C.in the neutral position
D.to be dismantled
A.stop valves
B.pressure relief valves
C.balance valves
D.regulating speed valves
A.steam plants, electric motors and compressed air
B.diesel engine, hydraulic machinery and compressed air
C.steam plants, electric motors and hydraulic machinery
D.diesel engines, steam plants and hydraulic machinery
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Using a file without a handle may result in （）
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