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沈括对地图学的贡献
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宋代博学家沈括在地图学领域最显著的贡献是什么?

A

首次系统描述了磁针指南功能

B

使用简化符号创造了密集编码解决方案

C

第一个观察到太阳黑子活动

D

测量月食以帮助重新校准历法

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