单项选择题
A.aeration of the oil B.contamination of the oil C.pump cavitation D.spongy actuator movements
A grease gun is generally used to lubricate a （）.A.cond...
单项选择题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
Thermostatic expansion valves can be adjusted for （）.A....
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
The amount of fluid friction or internal friction inher...
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
