指南针英文介绍ppt课件.pptx

compassThecompasswasintheearthsmagneticfieldusingmagnetsmadethenorth-southreferstopolarity(对立)apointtoinstrument.Whatiscompass?compassThewarringstatesperiodTheSongdynastyTheMingdynastyMain TimelineNowadayspolarity SiNaEarlyinthewarringstatesperiod,usingmagnetstoinventtheguidebookinstrument-polaritySiNa.guide fish Throughlong-termpracticeandtrialanderror,northernpeoplediscoveredtheartificially(人为地)magnetizationmethod,andtherebymadeguidefishandacompass.Zheng HesexpeditionsEspeciallyduringtheMingDynasty,ZhengHemadeexpeditionstoSouth-eastAsiaforseventimes,whichcontributestotheextensionanddevelopmentofseafaringandforeigntradeintheworld.SimplecompassMarxhadputacompassandprinting,theinventionofgunpowderiscalled“isbourgeois（资产阶级）developmentnecessarypremise.ComplexcompassNowGPShasalsobeenshowntobeanimportantciviliancommunitiesofinterest,andincreasinglywiderangeofapplication.functionfunctionDirectionFengshuiI n f l u e n c eI n f l u e n c e sailsailcultureculturecapitalismcapitalismOur country is the first state of polarity of the magnet refers to find.The invention of the compass to the world of the Chinese nation,is a great contributions to civilization.