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第四课 弹簧测力计
https://www.29294.com/press/1343399608633794560/book/1343399419994972160/unit/1343399420875776000/class/1343399421056131072
第五课 运动与摩擦力
https://www.29294.com/press/1343399608633794560/book/1343399419994972160/unit/1343399420875776000/class/1343399421093879808
第六课 运动的小车
https://www.29294.com/press/1343399608633794560/book/1343399419994972160/unit/1343399420875776000/class/1343399421144211456
第七课 设计制作小车(一)
https://www.29294.com/press/1343399608633794560/book/1343399419994972160/unit/1343399420875776000/class/1343399421186154496
第八课 设计制作小车(二)
https://www.29294.com/press/1343399608633794560/book/1343399419994972160/unit/1343399420875776000/class/1343399421232291840
郭建军