航海英語遇險通信單項選擇題每日一練(2019.05.05)

來源：考試資料網(wǎng)

1 Distress signals may be（）.

2 Wat is NOT required in the radiotelephone log?（）

3 Three short blasts of the whistle means（）.

4 What is the calling and distress frequency on a single side band (SSB) marine radiotelephone?（）

5 Which is NOT a distress signal? （）