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單項(xiàng)選擇題

The data travels from the（）to the INMARSAT Network Coordination Station（NCS）and then down to the SES’s on ships at sea.

A.VHF
B.SART
C.NAVTEX
D.LES

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單項(xiàng)選擇題

The（）provides the link between the Space Segment and the land-based National/International fixed communications networks.

A.VHF
B.SART
C.NAVTEX
D.LES

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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