短语词组短語Hollow rock drill steel 鑿巖釺杆用中空鋼;中空鋼Hollow -Drill Steel 空心鑽杆;空心鑽鋼hollow rock drill steel rolling 中空鋼軋制hollow drill steel bar 中空鑽杆鋼筋hollow drill steel steachdard 中空鑽杆鋼筋 返回 hollow drill steel