單項(xiàng)選擇題

Reliable delivery of messages is ensured by（）techniques.

A.forward error correction
B.aftward error correction
C.DGPS
D.error-free and low error reception

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How long must the GMDSS radio log be retained on board（）.

A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry

單項(xiàng)選擇題

Each satellite broadcasts（）traffic on a designated channel.

A.LES
B.ESA
C.NCS
D.EGC