9.用图中所示的装置探究�动�擦力跟接触面的粗糙程度的关系.1实验时用弹簧测力计水平拉动木块使它沿长木板做匀速直线运动根据二力平衡 Template




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tomski9.用图中所示的装置探究�动�擦力跟接触面的粗糙程度的关系.1实验时用弹簧测力计水平拉动木块使它沿长木板做匀速直线运动根据二力平衡 coloring