A.1.018~1.032B.0.7077~0.8025C.0.9020~0.9025D.0.8013~0.9000
A.乳稠計B.波美計C.糖錘度計D.普通密度計
A.x>xα,nB.x≥xα,nC.x≤xα,nD.x<xα,n