单项选择题
A.hydraulic steering B.follow-up steering C.remote control steering D.air controlled steering
（） is used for sensing the temperature of the room in t...
单项选择题（） is used for sensing the temperature of the room in the air condition system.
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
