单项选择题
Short cycling of a refrigeration compressor refers to （）.
A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow
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When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.
A.completely filled with saltwater
B.filled with de-scaling compound
C.tightly closed to exclude air
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A.second stage cylinder lockup
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Overheating of a hydraulic system may be a result of （）.
A.changing pump discharge pressure in response to normal load variations
B.a high oil level
C.incorrect fluid viscosity
D.continued slow re-circulation of the oil
