航海英語(yǔ)遇險(xiǎn)用語(yǔ)單項(xiàng)選擇題每日一練(2019.01.08)

來源：考試資料網(wǎng)

1 What is NOT a distress signal?（）

2 If you hear the firing of a gun at one minute intervals from another vessel，this indicates that（）.

3 If you are transmitting a distress message by radiotelephone you should（）.

4 A distress signal（）.

5 What is NOT a distress signal?（）