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1. 载流长直导线的磁场
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1. 载流长直导线的磁场
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http://d1.amobbs.com/bbs_upload782111/files_15/ourdev_450413.pdf
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Yarn Dyed Tie-dye
³ ³ L L r I l B B 2 0 d sin 4 d D S P 由几何关系有: sinD cosr E dsecE l ddtanl Edsec2EdE O P B & d E1 E E2 D I L l d r dl E E S P E E cosd 4 2 1 0 ³ d I ³ ...
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