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1 jan 960 ano - 【宋朝】水浮针演变成磁罗盘，采用24字分向法定窑兴盛【宋元时期】造船工艺和航海技术有了重大进步，海船载重量、抗沉性能明显提高，磁罗盘、实用航海图和天文定位技术广泛应用，使中国海船能够持续航行

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

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1 jan 960 ano

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