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
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相关考题
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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 -
单项选择题
The major source of chemical contaminants in hydraulic fluid is （）.
A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products
