---

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

---

出自：海船船员证

显示答案