题目

质检部门对甲、乙两工厂生产的同样产品抽样调查，计算出甲厂的样本方差为1.2，乙厂的样本方差为1.02，那么，由此可以推断出生产此类产品，质量比较稳定的是      厂．  答案：乙解析:因为S甲2=1.2＞S乙2=1.02，方差小的为乙，所以本题中质量比较稳定的是乙．  Great changes have taken place in that school．It is no longer ________ it was 20 years ago, ________ it was so poorly equipped． [　　] A． What ;when B． that; which C． what; which D． which; that