單項選擇題

（） 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

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單項選擇題

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

單項選擇題

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