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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A grease gun is generally used to lubricate a （）.
A.condensate pump ball bearing
B.main shaft bearing
C.main turbine bearing
D.diesel engine wrist pin bearing -
单项选择题
Thermostatic expansion valves can be adjusted for （）.
A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature -
单项选择题
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability
