航海英語海上通信基本知識(shí)單項(xiàng)選擇題每日一練(2019.01.13)

來源：考試資料網(wǎng)

1 Free communication effect is in direct proportion to（）.

2 Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT（）.

3 Sorry to have kept you（）for a long time.

4 The unit of duration of a dash in Morse Code is（）.

5 Automatic identification systems (AIS) are required to（）.