短語詞組短語sampling g investigation 抽樣調(diào)查double sampling serum investigation 雙份血清調(diào)查systematic sampling investigation 整群抽樣調(diào)查population sampling investigation 人口抽樣調(diào)查random sampling investigation 隨機抽樣調(diào)查statistical sampling investigation method 統(tǒng)計抽樣調(diào)查法national sampling investigation 全國抽樣調(diào)查method of sampling investigation 抽樣調(diào)查法sampling investigation of labor force 勞動力抽樣調(diào)查 返回 sampling investigation