单项选择题
A.a warp end B.a mooring winch C.a worm gear D.a barrel
Most anchor handling equipment incorporates （） for moor...
单项选择题Most anchor handling equipment incorporates （） for mooring purposes.
A.cable lifters B.spur wheels C.bollard D.warpends
A variable displacement system of hydraulic drives cons...
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
Which of the following hydraulic systems is not one of ...
单项选择题Which of the following hydraulic systems is not one of the three sub-division of the Hydraulic drive system?（）
A.Constant pressure system B.Variable pressure system C.Variable displacement system D.Constant volume system
