如图所示光�水平面上放有截面为14圆�的柱状物体aa与墙面之间放一光�的圆柱形物体b对a施加一水平�左的力f整个装置保持静止.若将a的 Template




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tomski如图所示光�水平面上放有截面为14圆�的柱状物体aa与墙面之间放一光�的圆柱形物体b对a施加一水平�左的力f整个装置保持静止.若将a的 coloring