A.100% B.30% C.不應(yīng)少于總數(shù)的30%,且不應(yīng)少于20根 D.不應(yīng)少于總數(shù)的30%,且不應(yīng)少于10根
A.不應(yīng)少于總數(shù)的30%,且不應(yīng)少于10根 B.不應(yīng)少于總數(shù)的20%,且不應(yīng)少于10根 C.不應(yīng)少于總數(shù)的30%,且不應(yīng)少于20根 D.不應(yīng)少于總數(shù)的20%,且不應(yīng)少于20根