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
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相关考题
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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 -
单项选择题
（）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
