∵由①得:2x<5,
x<52,
由②得:x-23x>-1,
13x>-1,
x>-3,
∴不等式组的解集为 -3<x<52.
The man ______ to enter the building two hours ago. [ ]
A. was seen
B. is seen
C. has been seen
D. will be seen
目标管理的实质上是()
A.一种面向成果的管理
B.一种面向过程的管理
C.一种面向开端的管理
D.一种面向某个阶段的管理