短語(yǔ)詞組短語(yǔ)emergency vent valve detail 緊急放風(fēng)閥locomotive emergency vent valve 機(jī)車(chē)緊急放風(fēng)閥emergency stop valve vent valve 緊急放風(fēng)閥emergency stop valve vent 應(yīng)急用排氣孔 返回 emergency vent valve