单项选择题
A.An expansion valve B.An evaporator C.A thermostat D.A condenser
The control spindle operates the slipper ring or （） of ...
单项选择题The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.
A.servo-motor B.swash plate C.plunger D.cylinder
Where tanks are arranged for either oil or ballast, （） ...
单项选择题Where tanks are arranged for either oil or ballast, （） must be fitted in the pipeline.
A.a change-over chest B.a head tank C.a emergency bilge pump D.an air cooler
The control rod of a steering gear pump is attached at ...
单项选择题The control rod of a steering gear pump is attached at its outer end to （）.
A.the hunting gear B.the rudder stock C.the rudder controller D.the feedback unit
