如图所示用细线吊着一个质量为m的小球使小球在水平面内做圆锥�运动关于小球受力正确的是 A.受重力拉力�心力b.受重力拉力c Template




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tomski如图所示用细线吊着一个质量为m的小球使小球在水平面内做圆锥�运动关于小球受力正确的是 a.受重力拉力�心力b.受重力拉力c coloring