单词	信道忙音
释义	信道忙音channel busy tone
随便看	level of aspiration level of assurance level of a test level [of a time varying quantity] level of attainment level of attention level of automation level of awareness level of--awareness level of burst level of confidence level of consumption level of control level of control case level of description level of detail level of detail{=lod} level of documentation level of emphasis level of escape level off level-off position level of free convection level of free convection (lfc) level of illumination