加速推小车～箱子里面的氢气球和注水球相对箱子会如何运动？～「像乌鸦一样思考」～「惯性」～「牛顿第一定律」～
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加速推小车～箱子里面的氢气球和注水球相对箱子会如何运动？～「像乌鸦一样思考」～「惯性」～「牛顿第一定律」～
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