存在“费用高；维护困难；系统维护需要开发单位的长期支持”等缺陷的企业IT项目建设模式是（）。

A．自主开发方式 

B．委托开发方式 

C.联合开发方式 

D．购置软件包

Which of the following is not one of the primary needs for good project scheduling ？（）

A．Cutting costs and reducing time.

B．Decreasing the time required for decision making.

C．Eliminating idle time.

D．Developing better trouble shooting procedures.