单项选择题
A.cause loss of hydraulic oil from the system
B.result in extreme damage to the pump
C.cause damage to the pump ff not continually drained from the pump casing
D.result in the system high side pressure to substantially drop off
单项选择题 In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the（）.
单项选择题 Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?（）
单项选择题 Which of the following statements describes the function of an air compressor intake filter?（）