（）is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.

This method includes following types of dependencies or precedence relationships:（）, the initiation of the successor activity, depends upon the completion of the predecessor activity.

（）, the initiation of the successor activity, depends upon the initiation of the predecessor activity.

（）is a method of constructing a project schedule network diagram that uses boxes or rectangles.

A．PDM

B．CPM

C．PERT

D．AOA

因为全局目录服务器害储存了树系中每一个其他域目录的部分信息，所以全局目录服务器需要额外的磁盘空间。