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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1.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

3.單項(xiàng)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

4.單項(xiàng)選擇題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