短语词组短语noise -figure indicator 噪声因数指示器noise spectrum figure 噪声谱图noise spectmm figure 噪声谱图noise figure meter 噪声指数测量仪;[电子]噪声系数测试仪;噪声系数测试系统;噪音指数计receiver noise figure monitor 接收机噪声指数监测器 返回 noise figure