单项选择题

Overgreasing of ball bearings installed on pumps will result in （）.

A.smoother pump operation
B.overheating of the bearing
C.reduced corrosion in the bearing
D.increased pump capacity

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单项选择题

A.kinetic energy
B.potential energy
C.mechanical energy
D.thermal energy

单项选择题

A.vaporizes in the condenser
B.reaches the compressor through the suction line
C.flashes in the liquid line
D.condenses in the receiver

单项选择题

A.heat
B.power
C.horsepower
D.foot-pound