signallingn.发信号；信号设备动词signal的现在分词形式.signaln.信号；标志v.(发信号)通知、表示adj.显著的signalling key of pull type拉引式信号开关signal-to-jamming ratio信干比signaling link test control信令链测试控制signaling information field信令信息字段signal officer-in-chief通讯兵司令signal roundtrip time delay信号往返时间滞后signalling key of push type按压信号开关signal transmission channel信道signal to noise ratio gains调制制度增益signaling originating point信号原发点