短语词组短語noise -figure indicator 噪聲因數指示器noise spectrum figure 噪聲譜圖noise spectmm figure 噪聲譜圖noise figure meter 噪聲指數測量儀;[電子]噪聲系數測試儀;噪聲系數測試系統;噪音指數計receiver noise figure monitor 接收機噪聲指數監測器 返回 noise figure