单项选择题
Each satellite broadcasts（）traffic on a designated channel.
A.LES
B.ESA
C.NCS
D.EGC
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相关考题
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单项选择题
At sea，all required GMDSS equipment（other than survival craft equipment）must be proven operational by（）.
A.daily testing
B.either A or C
C.operational use of the equipment
D.testing at least every 48 hours -
单项选择题
（） operates at a transfer rate of up to 9600 bits per second and is telephone，telex and facsimile（fax）capable.
A.INMARSAT A
B.INMARSAT C
C.SafetyNET
D.NAVTEX -
单项选择题
（） is not required by bridge-to-bridge communications.
A.VHF
B.SART
C.NAVTEX
D.LES
