A.數(shù)字數(shù)據(jù)在數(shù)字信道上B.數(shù)字數(shù)據(jù)在模擬信道上C.模擬數(shù)據(jù)在數(shù)字信道上D.模擬數(shù)據(jù)在模擬信道上
A.010 B.88 C.86 D.90