A.乳稠計(jì)B.波美計(jì)C.糖錘度計(jì)D.普通密度計(jì)
A.x>xα,nB.x≥xα,nC.x≤xα,nD.x<xα,n
A.異同檢驗(yàn)B.成對(duì)比較檢驗(yàn)C.三點(diǎn)檢驗(yàn)D.五中選二檢驗(yàn)