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單項選擇題

Which of the listed devices would be installed at a control system air pressure reducing station?（）

A.Moisture separator
B.Vacuum breaker
C.Lubricator
D.Non-return valve

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單項選擇題

Power is defined as the （）.

A.rate of doing work
B.amount of force needed to overcome friction
C.amount of work accomplished
D.distance through which an object is moved

單項選擇題

To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.

A.re-adjust the discharge pressure
B.clean the expansion valve screen
C.add refrigerant
D.adjust the expansion valve

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