According to ancient records, natural magnets were employed in China as direction-finding devices. T

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According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called （）during the Warring States Period.

A.wet compass

B.Si Nan

C.dry compass

D.navy compass

参考答案:

答案：Si Nan

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According to ancient records, natural magnets were employed in China as direction-finding devices. T

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