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航海英語(yǔ)GMDSS單項(xiàng)選擇題每日一練(2019.01.20)
來(lái)源：考試資料網(wǎng)
1
（） is not required by bridge-to-bridge communications.
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2
By using（）system a ship can send a distress message and know with certainty it will be received.
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3
EGC safetyNet transmits（）types of messages for mariners.
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4
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
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5
For GMDSS，which statement concerning a compulsory vessel is FALSE?（）
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