如图所示小球m放在光�的水平面上与竖直墙面接触处于静止状态那么小球受到的力为 A.重力b.重力地面的支持力和墙的弹力c.重力和对 Template




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tomski如图所示小球m放在光�的水平面上与竖直墙面接触处于静止状态那么小球受到的力为 a.重力b.重力地面的支持力和墙的弹力c.重力和对 coloring