[电] Bartlett's rrciprocation theorem

bā tè lái tè dào liàng dìng lǐ ㄅㄚ ㄊㄜˋ ㄌㄞˊ ㄊㄜˋ ㄉㄠˋ ㄌㄧㄤˋ ㄉㄧㄥˋ ㄌㄧˇ