航海英語應急預案與EMS單項選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

1 Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）

2 When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.

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3 When must a dry chemical fire extinguisher be recharged?（）

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4 Which characteristic is an advantage of Halon as a fire extinguishing medium?（）

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5 Which extinguishing agent is most effective on a mattress fire?（）

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