单项选择题

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.

A.aeration of the oil
B.contamination of the oil
C.pump cavitation
D.spongy actuator movements

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单项选择题

A.condensate pump ball bearing
B.main shaft bearing
C.main turbine bearing
D.diesel engine wrist pin bearing

单项选择题

A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature

单项选择题

A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability