A.whenever
B.however
C.wherever
D.whether
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A.negative displacement type
B.turbine type
C.positive displacement type
D.mixed-flow type
A.well ventilated
B.well clean
C.in good order
D.more room
A.lower
B.higher
C.the lower
D.the higher
A.evaporation
B.frosting
C.condensing
D.compressing
A.consume
B.distill
C.run
D.operate
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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
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Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
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Thermostatic expansion valves can be adjusted for （）.
When the steering gear is in operation, you should （）.
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The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）