谁都喜欢圆娃啊，圆同样周长里围出最大面积，滚动摩擦远小于滑动摩擦，一点点力就能推老远

来源: yzhl888 于 2024-02-15 13:46:21 [旧帖] [给我悄悄话] 本文已被阅读：次

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