如图所示,用细绳拴一小球在光�桌面上绕一铁钉系一绳套做匀速圆�运动,关于小球的受力,下列说法正确的是 A.重力、支持力 b.重力 Template




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tomski如图所示,用细绳拴一小球在光�桌面上绕一铁钉系一绳套做匀速圆�运动,关于小球的受力,下列说法正确的是 a.重力、支持力 coloring