短語詞組短語disposition of sample units 樣品処理symmetry sample units 對(duì)稱樣本單位send sample units 送樣單位;發(fā)送樣品單元Selection of Sample Units 樣本抽出方式variance within primary sample units 初級(jí)抽樣單位內(nèi)的方差variance between primary sample units 初級(jí)抽樣單位間的方差number of units in sample [統(tǒng)計(jì)]樣本單位數(shù) 返回 sample unit