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 Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.
单项选择题 The temperature of a refrigerant gas is the highest （）.
单项选择题 Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）