[电] resonant-circuit tyep frequency indicator

xié zhèn diàn lù xíng pín lǜ zhǐ shì qì ㄒㄧㄝˊ ㄓㄣˋ ㄉㄧㄢˋ ㄌㄨˋ ㄒㄧㄥˊ ㄆㄧㄣˊ lv4 ㄓˇ ㄕˋ ㄑㄧˋ