航海英語(yǔ)應(yīng)急預(yù)案與EMS單項(xiàng)選擇題每日一練(2019.01.18)

來(lái)源：考試資料網(wǎng)

1 Which precaution should be taken when testing a line throwing gun?（）

2 Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）

3 When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.

4 Which portable fire extinguisher should be used on a class C fire on board a vessel?（）

5 When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.