我国地面水水质标准按用途分为()类
A.4
B.5
C.6
D.7
参考答案:B
Mr. Reed made up his mind to devote all he had to ________ some schools for poor children.
A.set up
B.setting up
C.have set up
D.having set up
产业政策的目标是( )以及各产业内部运营的高效化。
A.产业结构优化
B.产业结构升级
C.产业结构的优化和升级
D.经济结构的转换问题