小明用如图所示的装置探究杠杆的机械效率每个钩码的质量为mo为支点.1他将2只钩码悬挂在b点在a点竖直�上 拉动弹簧测力计拉力为f1 Template




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tomski小明用如图所示的装置探究杠杆的机械效率每个钩码的质量为mo为支点.1他将2只钩码悬挂在b点在a点竖直�上 拉动弹簧测力计拉力为f1 coloring