[电] jiffered pulse recurrence frequ-ency

tiào dòng mài chōng chóng xiàn pín lǜ ㄊㄧㄠˋ ㄉㄨㄥˋ ㄇㄞˋ ㄔㄨㄥ ㄔㄨㄥˊ ㄒㄧㄢˋ ㄆㄧㄣˊ lv4