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 MagnetismhadbeenutilizedsinceancestralChineseinventingthecompass.Now,itplaysaveryimportantparteitherinourlifeorinscienceandtechnology.Forexample,radioandtelevisioncannotworkwithoutmagneticfield;peoplecuresomediseases,changetheactivityofyeastswithmagneticf (共 7633 字) [閱讀本文] >>