Before using a fixed CO2 system to fight an engine room fire，you must（）.
- Asecure the engine room ventilation
- Bsecure the machinery in the engine room
- Cevacuate all engine room personnel
- DAll of the above
问题
Before using a fixed CO2 system to fig
参考解析：
分类：燃烧与爆炸题库
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