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

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