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
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?（）
单项选择题 If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.
