A.波形抖動 B.雙峰和波形抖動 C.雙峰或多峰 D.無底波
A.2%,1% B.3%,1% C.±2%,±1% D.±3%,±1%
A.8~12dB B.12~15dB C.15~18dB D.18~21dB