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存在感超低、卻足可列入四大發明的代表性機械——指南車【轉載】 |
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點評
道長文化底蘊深厚
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Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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