单选题 1分

Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation __...

Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation ______.
  • A. is good for long term preserving since most insulation is organic and contains some amount
  • B. lowers the insulation value and is a common cause of fault grounds in idle machines
  • C. will enhance insulation resistance only if it is fresh water and contains no salt
  • D. reduces the amount of current supplied or drawn by the machine so horsepower is limited

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