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單項(xiàng)選擇題

（） 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

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單項(xiàng)選擇題

（） is not required by bridge-to-bridge communications.

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

單項(xiàng)選擇題

（）is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available.

A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4

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