指南针英文介绍课件

compasscompass1

Thecompasswasintheearth'smagneticfieldusingmagnetsmadethenorth-southreferstopolarity(对立)apointtoinstrument.Whatiscompass?compassThecompasswasintheear2

ThewarringstatesperiodTheSongdynasty

TheMingdynastyMainTimelineNowadaysThewarringstatesperiodThe3polaritySiNaEarlyinthewarringstatesperiod,usingmagnetstoinventtheguidebookinstrument-polaritySiNa.polaritySiNaEarlyinthewarr4guidefishThroughlong-termpracticeandtrialanderror,northernpeoplediscoveredtheartificially(人为地)magnetizationmethod,andtherebymadeguidefishandacompass.guidefishThroughlong-termp5ZhengHe’sexpeditionsEspeciallyduringtheMingDynasty,ZhengHemadeexpeditionstoSouth-eastAsiaforseventimes,whichcontributestotheextensionanddevelopmentofseafaringandforeigntradeintheworld.ZhengHe’sEspeciallyduringth6SimplecompassMarxhadputacompassandprinting,theinventionofgunpowderiscalled“isbourgeois（资产阶级）

developmentnecessarypremise".SimpleMarxhadputacompassa7ComplexcompassNow

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sailculturecapitalismInfluence

sailculturecapital10Ourcountryisthefirststateofpolarityofthemagnetreferstofind.TheinventionofthecompasstotheworldoftheChinesen