短語(yǔ)詞組短語(yǔ)automatic c telephone switchboard 自動(dòng);自動(dòng)電話交換機(jī)relay type automatic telephone switchboard 繼電器式自動(dòng)交換機(jī)semi -automatic telephone switchboard 半自動(dòng)式電話交換機(jī) 返回 automatic telephone switchboard