Which pregnancy-related physiologic change would place the client with a history of cardiac disease at the greatest risk for developing severe cardiac problems（）

A. Decreased heart rate.

B. Decreased cardiac output.

C. Increased plasma volume.

D. Increased blood pressure.

以下（）是信息系统的物理结构的基础部分。

A.生产管理

B.组织制度

C.质量管理

D.经营管理