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铁匠打铁 锻造铁锹过程 斧子跟铁锹锻造工艺 废铁轨加工铁铲
原标题：Amazing Production Shovels From Rail Steel, Most Satisfying Manufacturing Processes On Another Level 原作者：Diresta Machinery 侵删～
科普类 涨知识类 新奇趣闻2/61
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