The alarm signal for engine room catching fire is a blast of random bell follow by （）
- Atwo knock
- Bthree knocks
- Cfour knocks
- Dfive knock
问题
The alarm signal for engine room catch
参考解析：
分类：船舶电气与船舶安全题库
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3、（） in the engine room, the motormen co
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6、If a fire ignites in the engine room a
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