航海英語消防演習(xí)與作業(yè)單項(xiàng)選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

1 Halon fire extinguishers are NOT effective when used on which types of fires?（）

2 How do you operate a portable CO₂ fire extinguisher?（）.

3 How does foam extinguish an oil fire?（）.

4 Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.

5 Foam extinguishes a fire mainly by（）.