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四大发明是指什么谁发明的

更新时间: 2020-11-12 00:00:00     

四大发明是指造纸术、指南针、火药及印刷术。造纸术是由东汉蔡伦改进的。指南针是由栾大(雏形),指南针的始祖大约出现在战国时期,具体人不详。火药是由孙思邈发明的。活字印刷术是由毕升发明的。

关键词: 四大发明 什么 发明

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