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單項選擇題

The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.

A.interlocked
B.interconnected
C.interfered
D.interacted

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單項選擇題

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

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