()是指行政组织纵向结构的层级，它与管理幅度在一个特定的组织内成反比关系。
A.管理能力
B.管理跨度
C.管理层次
D.管理水平
参考答案：C
More and more people have realized we won't have cleaner water to drink unless something ______ soon.[ ]
A. was done
B. will be done
C. to be done
D. is done
辐亮度
