A、A.the four-way control valve failing to shift
B、B.the bleeder valve sticking in the open position
C、C.cold hydraulic fluid
D、D.a clogged air vent falter on the oil reservoir
更多“A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.”相关的问题
A、have gradually being exhausted B、are gradually exhausted C、has been gradually exhausted D、are being gradually exhausted
A、stop the engine immediately to prevent damage B、increase lube oil pressure C、slow the engine allowing it to gradually cool D、decrease the cooling water it temperature to the water jacket
A、should be gradually increased B、should be gradually reduced C、should be constantly kept D、should be varied up and down
A、absolute humidity decreases B、relative humidity increases C、specific humidity decreases D、dew point rises
A、increase discharge pressure B、decrease pump capacity C、decrease pump cavitation D、decrease reaction ring clearance
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