目前我国实行多层次的养老保险体制,即基本养老保险、企业自主的企业年金及()。
A.职工自愿的职工个人储蓄性养老保险
B.商业年金
C.基础养老
D.过渡性养老金
参考答案:A
It is reported that the United States uses ________ energy as the whole of Europe.
A.as twice
B.twice much
C.twice much as
D.twice as much
配制质量分数为10%的稀盐酸1000g,需质量分数为37%的浓盐酸的质量是( )
A.19g
B.100g
C.270.3g
D.350g