亚洲人成网站18禁止中文字幕,国产毛片视频在线看,韩国18禁无码免费网站,国产一级无码视频,偷拍精品视频一区二区三区,国产亚洲成年网址在线观看,国产一区av在线

 

Top 10 greatest inventions of ancient China

By Lin Liyao
0 Comment(s)Print E-mail China.org.cn, March 4, 2011
Adjust font size:


   Iron and steel smelting

It has been confirmed by archaeological evidence that iron, made from melting pig-iron, was developed in ancient China in the early 5th century BC during the Zhou Dynasty (1050 BC-256 BC). During the Shang Dynasty (1600 BC-1046 BC) to the Eastern Zhou Dynasty (1050 BC-256 BC), China went into a flourishing period for steel smelting. In the Han Dynasty (202 BC-220 AD), private-enterprise iron-making was abolished and was monopolized by the state, creating an iron-smelting bloom. The first famous metallurgist in ancient China is Qiwu Huaiwen of the Northern Wei Dynasty (386-557 AD), who invented the process of using wrought iron and cast iron to make steel.


<  1  2  3  4  5  6  7  8  9  10  >  


Follow China.org.cn on Twitter and Facebook to join the conversation.
ChinaNews App Download
Print E-mail Bookmark and Share

Go to Forum >>0 Comment(s)

No comments.

Add your comments...

  • User Name Required
  • Your Comment
  • Enter the words you see:   
    Racist, abusive and off-topic comments may be removed by the moderator.
Send your storiesGet more from China.org.cnMobileRSSNewsletter
    1. <ul id="556nl"><kbd id="556nl"><form id="556nl"></form></kbd></ul>
      <thead id="556nl"></thead>

      1. <em id="556nl"><tt id="556nl"></tt></em>
        <ul id="556nl"><kbd id="556nl"><form id="556nl"></form></kbd></ul>

        <ul id="556nl"><small id="556nl"></small></ul>
        1. <thead id="556nl"></thead>

          亚洲人成网站18禁止中文字幕,国产毛片视频在线看,韩国18禁无码免费网站,国产一级无码视频,偷拍精品视频一区二区三区,国产亚洲成年网址在线观看,国产一区av在线 人妻无码久久影视 日韩久久久久久久久久久久 精品国产香蕉伊思人在线 无码国产手机在线a√片无灬 91在线视频无码