分析成本构成结果，找出各种可以相互替代的成本，协调各种成本之间的关系，属于（）的内容

A、识别和分析项目成本构成科目 

B、成本估算 

C、成本预算 

D、成本审评

When administering gentamicin to a preschooler, which of the following monitoring schedules is best for determining the drug's effectiveness

A．A serum trough level every morning.

B．A serum peak level after the second dose.

C．A serum trough and peak level around the third dose.

D．Serial serum trough levels after three doses (24 hours).