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單項(xiàng)選擇題

According to the way the steering gear is operated, the steering gear may be divided into: hand - steering, （） and automatic steering.

A.hydraulic steering
B.follow-up steering
C.remote control steering
D.air controlled steering

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單項(xiàng)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

單項(xiàng)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

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