[{"title":"( 49 个子文件 19.58MB ) 电磁场与电磁波_课件PPT_北交大","children":[{"title":"第四章","children":[{"title":"CH4S1.PPT <span style='color:#111;'> 1008.00KB </span>","children":null,"spread":false},{"title":"CH4.PPT <span style='color:#111;'> 42.50KB </span>","children":null,"spread":false},{"title":"CH4S2.PPT <span style='color:#111;'> 959.00KB </span>","children":null,"spread":false},{"title":"CH4S4.ppt <span style='color:#111;'> 540.00KB </span>","children":null,"spread":false},{"title":"CH4S8.PPT <span style='color:#111;'> 502.00KB </span>","children":null,"spread":false},{"title":"CH4S3.ppt <span style='color:#111;'> 444.50KB </span>","children":null,"spread":false},{"title":"CH4S5.ppt <span style='color:#111;'> 585.50KB </span>","children":null,"spread":false},{"title":"CH4S7.PPT <span style='color:#111;'> 498.00KB </span>","children":null,"spread":false}],"spread":true},{"title":"第三章","children":[{"title":"CH3S3.ppt <span style='color:#111;'> 494.00KB 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