[通信] 环路电池脉冲发生 loop-battery pulsing: 环路电池脉冲发生battery pulsing: 用电池发脉冲loop pulsing: 回路脉冲法battery and ground pulsing: 电池地脉冲loop disconnect pulsing: 回路断路脉冲发送制下载手机词典可随时随地查词查翻译