7.某同学用图7所示的装置研究匀速提起重物时重物所受拉力的特点他每次都用电动机匀速提起同一重为2牛的小球并用弹簧测力计测出小球所受的拉力 Template




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tomski7.某同学用图7所示的装置研究匀速提起重物时重物所受拉力的特点他每次都用电动机匀速提起同一重为2牛的小球并用弹簧测力计测出小球所受的拉力 coloring