航海英語救生設(shè)備單項(xiàng)選擇題每日一練(2019.01.07)

來源：考試資料網(wǎng)

1 Each lifeboat must be lowered and maneuvered in the water at least once every（）.

2 On a ship，a cabinet or space containing the controls or valves for the fixed firefighting system must be（）.

3 The connection facilities for the international shore connection must be located to provide access（）.

4 On a ship，how many ring buoys are required to have a buoyant line attached?（）

5 On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）