如图所示杠杆在物体a和力f的作用下处于平衡现在只将力f的方�改为沿图中虚线方�要使此杠杆仍保持与原来相同位置平衡必须a.f增大 B.f Template




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tomski如图所示杠杆在物体a和力f的作用下处于平衡现在只将力f的方�改为沿图中虚线方�要使此杠杆仍保持与原来相同位置平衡必须a.f增大 b.f coloring