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2楼是正解øû‡è¿5ƒÔ}bbs.3c3t.comž×+îH‰P»Ž
筛一次保留2位小数øû‡è¿5ƒÔ}bbs.3c3t.comž×+îH‰P»Ž
筛2次取平均保留1位小数øû‡è¿5ƒÔ}bbs.3c3t.comž×+îH‰P»Ž
详见52-2006øû‡è¿5ƒÔ}bbs.3c3t.comž×+îH‰P»Ž

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