单选题Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they ().Aare exposed to a vacuumBcome in contact with extremely hot surfacesCare reduced in temperature to just above the pour pointDbecome extremely agitated or aerated
单选题
Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they ().
A
are exposed to a vacuum
B
come in contact with extremely hot surfaces
C
are reduced in temperature to just above the pour point
D
become extremely agitated or aerated
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