单项选择题

A compound gage is used to measure （）.

A.temperature and pressure
B.humidity and temperature
C.pressure and vacuum
D.pressure and humidity

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单项选择题

A.capacity of 0%
B.efficiency of 100%
C.internal slippage of 0%
D.shut off horsepower rating of 100%

单项选择题

A.series of baffles
B.crossover pipe
C.condensate separator
D.drain pump

单项选择题

A.at the compressor discharge
B.at the compressor suction
C.in the expansion valve
D.in the receiver