count model, with retirees trading much or all of their guaranteed payments for payments depending on investment returns. For younger families the picture is not any better. Both the absolute cost of

A.适合于大体积混凝土工程的水泥有()。A、普通水泥B、硅酸盐水泥C、矿渣水泥D、火山灰水泥E、粉煤灰水泥


B.为减少解冻食品时开关微波炉的次数,可预先将食品从冰箱冷冻室移入冷藏室,慢慢解冻,并充分利用冷冻食品中的“()能”


C.男性,65岁。既往有糖尿病病史。患者急性发病后四肢不能动弹,不能言语,不能吞咽,但意识清楚并能以睁眼闭眼和眼球的上下活动与医生建立联系。该患者的病变部位在()


D.下面关于USB优盘的描述中,错误的是