航海英語消防用語單項(xiàng)選擇題每日一練(2019.01.17)

來源：考試資料網(wǎng)

1 The discharge side of every fire pump must be equipped with a（）.

2 On a ship，watertight doors should be operated（）.

3 One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.

4 The blocking or absence of fire dampers can cause（）.

5 After using a Halon extinguisher，it should be（）.