Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
- Acheck and regulate the water level
- Bclose the air cock once fires are lit
- Cblowdown the gage glass
- Dcrack the steam stop to assure protective steam flow
问题
Prior to lighting off a cold automatic
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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