单选题 1分

Although lube oils used in the main lubricating service systems should have a relatively high flash ...

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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  • 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