单选题In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）Aavoid false alarms as a result of condensing water vaporBavoid danger of frost under very cold weatherCreduce the viscosity of the crankcase atmosphere in order to improve the fluidityDkeep the temperature of the oil mist detectors in an appropriate range
单选题
In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）
A
avoid false alarms as a result of condensing water vapor
B
avoid danger of frost under very cold weather
C
reduce the viscosity of the crankcase atmosphere in order to improve the fluidity
D
keep the temperature of the oil mist detectors in an appropriate range
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