买5个不同牌子的,每个手指上夹一个,5个结果中,去掉一个最高分,去掉一个最低分,剩下的三个结果取平均值,就是你要的结果。
买5个不同牌子的,每个手指上夹一个,5个结果中,去掉一个最高分,去掉一个最低分,剩下的三个结果取平均值,就是你要的结果。
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