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简介：But Zhu Cixi discovered a problem, that is, the lead bullets produced by the firearms factory were not smooth enough, and some were even very rough. This not only increased the resistance in the blunderbuss tube, but also increased the risk of explosion. After being shot from the blunderbuss tube, the air The resistance inside would also increase, so he thought about how to make lead bullets as smooth as jade like in his previous life?