下列有关数组的叙述中，错误的是( )。

A．在同一个环境下，数组与内存变量可以同名，两者互不影响

B．可以用一维数组的形式访问二维数组

C．在可以使用简单内存变量的地方都可以使用数组元素

D．一个数组中各元素的数据类型可以相同，也可以不同

You are the project manager of Alpha Network Inc. Your company is doing network planning for a major bank. You are planning to digram the activity dependancies using activity list. Which of the following is true ？（）

A．PDM is also the AOA diagramming method.

B．PDM is also the AOD digramming method.

C．PDM is also AON digramming method.

D．PDM is also ADM diagramming method.