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问题 单项选择题

作为一个网络管理员，什么原因会让你在同一个网络中同时使用两种动态路由协议（）。

A.方便路由汇总

B.方便路由重分发

C.为了减小网络中路由协议的开销

D.将一种落后的路由协议过渡到一种先进的路由协议

答案

参考答案：C

单项选择题

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. （）is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more（）. A diagram graphically represents things, and the relationships between these things. These（）can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams.（）are used to capture the physical organization of the things in your system, i.e., how one object relates to another.（）focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

In general, a UML model is made up of one or more（）.

A．views 　

B．diagrams 　

C．user views 　

D．structure pictures
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选择题

总面积排广东省第六县级行政区惠东，从1983年拥有2445个自然村，到2011年锐减到2010个，近30年时间全县有435个村庄消失，年均消失14．5个。这反映了                            

A．农业生产衰败

B．城市化进程发展

C．计划生育使人口减少

D．乡镇企业发展壮大
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