航海英語(yǔ)GMDSS單項(xiàng)選擇題每日一練(2019.01.20)

來源：考試資料網(wǎng)

1 （） is not required by bridge-to-bridge communications.

2 By using（）system a ship can send a distress message and know with certainty it will be received.

3 EGC safetyNet transmits（）types of messages for mariners.

4 The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

5 For GMDSS，which statement concerning a compulsory vessel is FALSE?（）