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 "n": 51,
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  "mean": 0.9693,
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 "note": "ratio = 成交价 / 采购预算(预算或最高限价)。只统计采购需求与成交公告按项目编号硬配对的样本; 样本少时区间宽, 仅为已发生项目的观察, 不是对未成交项目的报价或估价。",
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