航海英語救生設(shè)備單項選擇題每日一練(2019.01.16)

來源：考試資料網(wǎng)

1 How many life buoys（）on board with self-igniting light?

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

3 On a ship，a fixed carbon dioxide or other approved system must be installed（）.

4 In launching a covered lifeboat，what would safely lower the lifeboat from inside the lifeboat cabin?（）

5 Each open lifeboat carried on a vessel on an international voyage must have（）.