The cost management plan has all of the following characteristics EXCEPT: （）.

A．It is based on the project cost estimates, and is separate from the project pla

B．Can establish variance thresholds for costs or other indicator

C．May be formal or informal, highly detailed or broadly frame

D．Documents the cost management processes and their associated tools and technique

社会工作研究方法中，定量研究是不适用于( )等场合。

A．无权威和不受控制

B．宏观层面的大规模的调查与预测

C．研究问题已有大量资料

D．资料收集相对容易