短語詞組短語Hollow rock drill steel 鑿巖釺桿用中空鋼;中空鋼Hollow -Drill Steel 空心鑽桿;空心鑽鋼hollow rock drill steel rolling 中空鋼軋制hollow drill steel bar 中空鑽桿鋼筋hollow drill steel steachdard 中空鑽桿鋼筋 返回 hollow drill steel