短語詞組短語Hollow rock drill steel 鑿巖釬桿用中空鋼;中空鋼Hollow -Drill Steel 空心鉆桿;空心鉆鋼hollow rock drill steel rolling 中空鋼軋制hollow drill steel bar 中空鉆桿鋼筋hollow drill steel steachdard 中空鉆桿鋼筋 返回 hollow drill steel