航海英語探火與消防設(shè)備單項選擇題每日一練(2019.01.09)

來源：考試資料網(wǎng)

1 A portable dry chemical fire extinguisher discharges by（）.

2 A CO₂ portable extinguisher is annually checked by（）.

3 No outlet on a fire hydrant may point above the horizontal in order to（）.

4 A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

5 A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.