单项选择题

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

相关考题

Reliable delivery of messages is ensured by（）techniques...

单项选择题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

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

单项选择题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

Each satellite broadcasts（）traffic on a designated chan...

单项选择题Each satellite broadcasts（）traffic on a designated channel.

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