航海英語單項選擇題每日一練(2019.09.16)

來源：考試資料網(wǎng)

1 Progressive flooding may be indicated by（）.

2 The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.

3 When should the emergency position-indicating radiobeacon be activated after abandoning a ship?（）

4 An inflatable liferaft should be manually released from its cradle by（）.

5 The above mentioned ship has been duly（）in accordance with the provisions of the convention referred to.