经络系统中，具有维持人体正常运动功能的是（）
A.十二经脉
B.十五络脉
C.十二经别
D.十二经筋
E.十二皮部
参考答案：D
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
试述中国饮食文化的基本特征。
