用图1所示的装置探究�擦力跟压力大小的关系.1实验时拉动木块在水平木板上做匀速直线运动弹簧测力计的示数就等于�擦力的大小因为这时的 Template




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tomski用图1所示的装置探究�擦力跟压力大小的关系.1实验时拉动木块在水平木板上做匀速直线运动弹簧测力计的示数就等于�擦力的大小因为这时的 coloring