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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 ______. (235892:第1章船舶主推进装置:448)

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

正确答案:A (备注:此答案有误)

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