短語詞組短語rail and -structural steel mill 軌梁軋機(jī)Rail Of Self -Hardening Steel 自淬硬鋼鋼軌;自淬硬鋼鐵軌Bulb -Rail Steel 球頭丁字鋼;球頭丁字鋼梁heavy -rail carbon steel 碳素重軌鋼rail -and-structural steel mill 軌梁軋機(jī)bulb rail steel T -bulb steel 球頭丁字鋼V -type Double rail with Steel-ball 鋼珠雙平軌 返回 rail steel