重症营养性缺铁性贫血典型的血象应是（）

A.以红细胞减少为主

B.以血红蛋白减少为主

C.血红蛋白、红细胞成比例地减少

D.血L红蛋白正常，红细胞减少

E.血红蛋白减少，红细胞正常

The Unified Modeling Language is a standard graphical language for modeling object-oriented software-（）can show the behavior of systems in terms of how objects interact with each other.

A.Class diagram

B.Component diagram

C.Sequence diagram

D.Use case diagram