A.1/10 B.1/100 C.1/1000 D.1/10000
A.數(shù)字調(diào)幅 B.數(shù)字調(diào)相 C.數(shù)字調(diào)頻
A.+5;0.5 B.+3;0.5 C.+5;0.1 D.+3;0.1