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[问与答] 请教各位物理学家，斜坡无动力小车，怎么样才能跑更远

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小学生的科技节作业，要求是不能始于套件，手工制作，不添加额外的重量，有什么好的制作建议

具体要求看下面的图片，imgur 图床

oSWiXsv.png

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