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五、技术先进、源远披长的铸铁金属型早期铁铸件沿用青铜器陶范铸造的技法,但增加了铸范泥料中的含砂量和颗粒度,以提
Fifth, advanced technology, a long history of casting iron cast iron metal early iron bronze casting method used along the line, but increased cast sand slurry in the sand content and particle size to mention