单项选择题
A.temperature and pressure B.humidity and temperature C.pressure and vacuum D.pressure and humidity
A centrifugal pump attempting to develop flow against a...
单项选择题A centrifugal pump attempting to develop flow against a closed discharge valve has a/an （）.
A.capacity of 0% B.efficiency of 100% C.internal slippage of 0% D.shut off horsepower rating of 100%
Condensate formed within the first-effect tube nest of ...
单项选择题Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.
A.series of baffles B.crossover pipe C.condensate separator D.drain pump
The temperature of a refrigerant gas is the highest （）....
单项选择题The temperature of a refrigerant gas is the highest （）.
A.at the compressor discharge B.at the compressor suction C.in the expansion valve D.in the receiver
