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开挖工程中鑿炮眼用的中空鋼钎,在使用中经常折断。当断钎的長度短于头门钎时(1公尺以下),即不能使用而成廢鋼。在流溪河
In the excavation project, the hollow steel drill used for chiseling eyes is often broken when in use. When the length of brazing is shorter than the length of the door (less than 1 meter), it can not be used as scrap. In Liuxihe