[电] transmission-line-tuned transmission type frequency meter

chuán shū xiàn tiáo xié chuán shū xíng pín lǜ jì ㄔㄨㄢˊ ㄕㄨ ㄒㄧㄢˋ ㄊㄧㄠˊ ㄒㄧㄝˊ ㄔㄨㄢˊ ㄕㄨ ㄒㄧㄥˊ ㄆㄧㄣˊ lv4 ㄐㄧˋ