4.如图所示光�水平面上小球在拉力作用下做匀速圆�运动.若小球运动到点时拉力�生变化关于小球运动情况的说法正确的是 A.若拉力 Template




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tomski4.如图所示光�水平面上小球在拉力作用下做匀速圆�运动.若小球运动到点时拉力�生变化关于小球运动情况的说法正确的是 a.若拉力 coloring