20.如图甲所示为学校操场上一质量不计的竖直�杆�杆上端固定下端悬空为了研究学生沿杆的下�情况在竿的顶部装有一拉力传感器可显示竿顶端 Template


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tomski20.如图甲所示为学校操场上一质量不计的竖直�杆�杆上端固定下端悬空为了研究学生沿杆的下�情况在竿的顶部装有一拉力传感器可显示竿顶端 coloring