The most common cause of lowering the crankcase lube oil flash point is （）.<br>A:more water contents<br>B:contamination with fuel oil<br>C:higher temperature<br>D:sufficient cooling of oil mist

The most common cause of lowering the crankcase lube oil flash point is （）.
A:more water contents
B:contamination with fuel oil
C:higher temperature
D:sufficient cooling of oil mist

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