5.实验室常用的弹簧测力计如图甲所示连接有挂钩的拉杆与弹簧相连并固定在外壳一端o上外壳上固定一个圆环可以认为弹簧测力计的总质量主要集中 Template




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tomski5.实验室常用的弹簧测力计如图甲所示连接有挂钩的拉杆与弹簧相连并固定在外壳一端o上外壳上固定一个圆环可以认为弹簧测力计的总质量主要集中 coloring