片语
The West extension line西延线
coefficient of extension line展线系数
extension n line分机线
leading-out wire[电] 引出线
extension line for dimension尺寸标注引出线
restricted extension line受限分机线
pulse extension line脉沖扩充线
extension and line counter specification扩展和行计数说明
extension cord延长线;分机线绳
extension line offset尺寸界线偏移