单选题All VHF marine band radios operate in the simplex mode，which means that（）.Aonly one person may talk at a timeBonly two persons may talk at the same timeCthe radio only transmitsDthe radio only receives
单选题
All VHF marine band radios operate in the simplex mode，which means that（）.
A
only one person may talk at a time
B
only two persons may talk at the same time
C
the radio only transmits
D
the radio only receives
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