单项选择题

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

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单项选择题
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
单项选择题
On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.

A.splash method
B.mechanical force feed lubricators
C.detached sump method
D.internal cooling passages in the crankshafts and connecting rods
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