指南针英文介绍ppt课件.pptx
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1、,compass,The compass was in the earths magnetic field using magnets made the north-south refers to polarity(对立) a point to instrument.,What is compass?,compass,The warring states period,The Song dynasty,The Ming dynasty,Main Timeline,Nowadays,polarity SiNa,Early in the warring states period, using m
2、agnets to invent the guidebook instrument - polarity SiNa.,guide fish,Through long-term practice and trial and error, northern people discovered the artificially(人为地) magnetization method, and thereby made guide fish and a compass.,Zheng Hesexpeditions,Especially during the Ming Dynasty, Zheng He ma
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