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number of person-days
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number of person-days
Encyclopedia
工学
膳食调查
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number of person-days
人日数
包括总人日数和个人人日数,是指以被调查对象的一日三餐为标准折合的用餐天数,将每人每日的三餐定义为一个人日。
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confidence region estimation
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更新时间:2026/7/5 3:09:56