我国宏观调控的主要目标有[ ]
①促进经济增长,增加就业②维护市场经济秩序③稳定物价,保持国际收支平衡④发挥市场的基础性调节作用
A.①②
B.③④
C.①③
D.②④
答案:C
Miss Li is teaching ___________the classroom and I am sitting ________ my friend.
A. in front of; in the front of B. behind; in the front of
C. in the front of; behind
IP电信承载网要求网络自动修复故障时间小于等于()。
A.50ms
B.10ms
C.50s
D.1s