行政组织的纵向结构,管理学上称为直线式结构。其优点在于()。
A、分工精细
B、事权集中
C、权责明确
D、指挥统一
E、便于控制
参考答案:B, C, D, E
已知一元二次方程x2-10x+9=0两个根是x1,x2,那么x1+x2=( )
A.9 B.-9 C.10 D.-10
I am wondering _________. [ ]
A. why did he come to school late
B. why he came to school late
C. that he came to school late
D. why was he late for school