今天为大家推荐知乎的 2 个宝藏科普回答,一起看看今天的宝藏好文吧~
京杭大运河是如何穿过淮河或黄河的,黄河是地上河呀?
![京杭大运河是如何穿过淮河或黄河?](https://www.xinenw.com/wp-content/themes/justnews/themer/assets/images/lazy.png)
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![京杭大运河是如何穿过淮河或黄河?](https://www.xinenw.com/wp-content/themes/justnews/themer/assets/images/lazy.png)
1.锌和铜锌合金冶炼难在何处
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2.明代以前的黄铜制品一览
![京杭大运河是如何穿过淮河或黄河?](https://picx.zhimg.com/50/v2-95be231220ffdbdba158db57d6315072_720w.jpg?source=2c26e567)
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3.新石器时代的黄铜是怎么冶炼的
![京杭大运河是如何穿过淮河或黄河?](https://picx.zhimg.com/50/v2-c286dea001e15117aa7f489a0fe09230_720w.jpg?source=2c26e567)
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周家庄铜片
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尽管据报导在仰韶文化遗址中发现有个别的铜制品,但学术界对其年代多有质疑,暂不考虑。真正中原地区开始少量出现早期铜器是在龙山文化时期,二里头文化开始数量显著增加。(张海等:《史前青铜冶铸业与中原早期国家形成的关系》)
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(1)在混合矿固体还原工艺炼得的块状黄铜中,锌的分布明显不均匀,锌含量的差异在不同区域间颇为显著;不同区域的铅含量亦存在较大差异,铅元素分布不具备「点状分布于晶界上」的分布特性。
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4.史前黄铜在冶金史上的地位
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5.姜寨黄铜与中国冶金独立起源假说
这些东西,自从搞清楚制法之后,从来没有学者说是外来的,因为只此一家别无分号。
题图来源:答主 @免渡河
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