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______ 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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单选题（） operates at a transfer rate of up to 9600 bits per second and is telephone，telex and facsimile（fax）capable.A
INMARSAT AB
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SafetyNETD
NAVTEX
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