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单选题
Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）
A
The oil oxidizes and forms carbon deposits
B
The viscosity increases
C
Engine oil consumption decreases
D
Lubricating qualities of the oil are enhanced
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单选题Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）A
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