Team-building activities have all of the following characteristics EXCEPT:

A．Some group activities, such as developing the WBS。can increase team cohesiveness when that planning activity is structured and facilitated wel

B．Should only be considered after major conflicts within the project team, since they generally waste precious resource time and cause schedule delay

C．Are particularly valuable when team members operate virtually from remote locations, without the benefit of face-to-face contac

D．Can vary from a five-minute agenda item in a status review meeting to an off-site, professionally facilitated experience designed to improve interpersonal relationship

数据库系统的核心是【 】。

A．数据模型

B．数据库管理系统

C．数据库

D．数据库管理员