比率估計的近似方差 variance of ratio estimate: 比率估計值的方差approximate estimate: 概算估(計)價; 概算估價; 約略估計, 概算estimate of variance: 方差估計estimate variance: 估計方差; 收入概算amended sum of approximate estimate: 修正總概算下載手機詞典可隨時隨地查詞查翻譯