航海英語緊急用語單項選擇題每日一練(2019.01.22)

來源：考試資料網(wǎng)

1 The radiotelegraph alarm signal is（）.

2 The best method to stop a vessel from dragging anchor in a sand bottom is to（）.

3 Messages concerning weather conditions transmitted by radiotelephone are preceded by（）.

4 The expression DROP ANCHOR means（）.

5 If you wished to transmit a message by voice concerning the safety of navigation，you would preface it by the word（）.