怎样让上滚的圆锥滚得更远?如题.另外http://edu6.teacher.com.cn/tkc028a/lesson/exp/paras/para1/para1_2-2.htm中,为什么“双圆锥体可以向上坡方向滚动,通过三角函数运算可得,要使圆锥体上转,应满足不等式

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