A、模擬信號(hào)傳輸模擬數(shù)據(jù) B、模擬信號(hào)傳輸數(shù)字?jǐn)?shù)據(jù) C、數(shù)字信號(hào)傳輸數(shù)字?jǐn)?shù)據(jù) D、數(shù)字信號(hào)傳輸模擬信號(hào)