如图所示.直径为d的圆环是用粗细均匀的电阻制成的总电阻为r1的2倍图中abc H为圆环上的等分点.a点固定p为�片能沿圆�动并 Template




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tomski如图所示.直径为d的圆环是用粗细均匀的电阻制成的总电阻为r1的2倍图中abc h为圆环上的等分点.a点固定p为�片能沿圆�动并 coloring