如图所示用细线吊着一个小球使小球在水平面内做匀速圆�运动.关于小球的受力情况正确的是 A.重力绳子的拉力�心力 b.重力绳子的 Template




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tomski如图所示用细线吊着一个小球使小球在水平面内做匀速圆�运动.关于小球的受力情况正确的是 a.重力绳子的拉力�心力 b.重力绳子的 coloring