In the project management context,（）includes characteristics of unification, consolidation, articulation, and integrative actions that are crucial to project completion, successfully meeting customer and other stakeholder requirements, and managing expectations.

A．integration

B．scope

C．process

D．charter

在R、L、C串联的交流电路中，当总电压相位落后于电流相位时，则（）。

A.XL＞XC；

B.XL＜XC；

C.XL=XC；

D.R+XL＞XC;