词汇	listening channel
释义	listening channel 监听通路
随便看	time delay closing relay time-delay closing relay time delay command time-delay command time delay compensation time-delay compensation Time delay compensa-tion time delay constant time-delay constant time-delay contact time-delay contactor relay time delay control time-delay control time delay correction time delay correction means time delay correlation time delay de-energizing time delay-dependent time-delay dependent time-delay-dependent time delay device time-delay device time-delay device, electrical time-delay device, mechanical time delay difference