如图所示在光�的轨道上小球�下经过圆孤部分的最高点a时恰好不脱离轨道此时小球受到的作用力有 A.重力弹力和�心力b.重力和弹力 Template




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tomski如图所示在光�的轨道上小球�下经过圆孤部分的最高点a时恰好不脱离轨道此时小球受到的作用力有 a.重力弹力和�心力b.重力和弹力 coloring