同学们用如图所示的“杆线�”研究�的�期与等效重力加速度的关系杆线�可以绕着立柱oo来回�动(立柱并不转动),使�球的运动轨迹被约束在一个 Template


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tomski同学们用如图所示的“杆线�”研究�的�期与等效重力加速度的关系杆线�可以绕着立柱oo来回�动(立柱并不转动),使�球的运动轨迹被约束在一个 coloring