All VHF marine band radios operate in the simplex mode，which means that______．A.only one person may talk at a timeB.only two persons may talk at the same timeC.the radio only transmitsD.the radio only receives
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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