短語詞組短語motor throat diameter 發(fā)動機噴管喉道直徑pitch throat diameter 節(jié)圓喉徑Exit Throat Diameter 喉口直徑die throat diameter 模孔直徑outer throat diameter 最大喉徑inner throat diameter 鹵根喉徑graphite throat diameter 石墨吸口直徑 返回 throat diameter