The great sea voyages of Europes Age of Discovery, such as Christopher Columbuss trip to the West Indies in 1492, would have been impossible without the use of a compass. This great device for sea voyages was introduced to the West from China during the thirteenth century A.D. We have to thank ancient Chinese for their invention of the compass. The jade connection is important. Lodestone is a hard materialthough not as hard as some jade. And the making of a magnetic ladle, as well as a highly smooth stone board, would have required great skill. This suggests that the compass was invented by the jade finders of ancient China.
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2014人教新目标英语八下unit 9《Have you ever been to a museum》 section b课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 3a-4c(含grammar focus)课件
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人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA2d)ppt课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 3a课本听力素材(mp3)
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 1b课本听力素材(mp3)
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》words单词听力朗读素材(mp3)
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 2a课本听力素材(mp3)
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionB-1d)mp3课文音频
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionB 3a-3c)ppt课件
2014人教新目标英语八下unit 9《Have you ever been to a museum》 period 2课件
2014人教新目标英语八下unit 9《Have you ever been to a museum》 period 4课件
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人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionB Self)ppt课件
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionB 2)ppt课件
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA 2)ppt课件
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA3a-3c)ppt课件
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人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA-2b)mp3课文音频
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 2d课本听力素材(mp3)
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 1a-1e课件
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人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA-1b)mp3课文音频
人教版[2013版]英语八上Unit 9《Can you come to my party》(Pronunciation)mp3课文音频
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 2b课本听力素材(mp3)
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》课件
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionB 1)ppt课件
人教版[2013版]英语八上Unit 9《Can you come to my party》(SectionA-2d)mp3课文音频