题目

      Raising children has traditionally been a mother’s role. People think that kids have to be with mothers mostly, but the modern sociology says when a father is not involved in(参与) life, it leads to problems. Children abandoned(抛弃） or ignored（忽视） by their fathers do not succeed as well as children in families where both parents are involved.      At the River House in Maryland, a church community is running a program called the Men’s Retreat with the purpose of helping men become better fathers. Here fathers can get parental advice. The program is also一支规格为AmL的酸式滴定管，其尖咀部分充满液体时，液面在mmL刻度处，当液面降低到nmL刻度处时，下列判断正确的是（　　） A、流出的流体的体积是（m-n）mLB、流出的液体的体积是（n-m）mLC、滴定管内剩余的液体的体积是（A-n）mLD、滴定管内剩余的液体的体积大于（A-n）mL