把一个圆平均分成若干等份后，能拼成一个周长为20.7分米的长方形，这个圆形的面积

世界文化具有以下特点[     ]

①多样性

②差异性

③单一性

④排斥性

A．①②

B．②③④

C．①②④

根据《关于制定本地网无线接入电话业务试行资费标准的通知》，基本月租费按照固定电话甲乙种基本月租费的算术平均数制定，可上下浮动______，试行期______。（）

A.10%；一年

B.20%；一年

C.20%；两年

D.10%；两年

新闻的结语，一般指新闻的最后一句或一段话，往往是对新闻的总结、评论或展望等等。阅读下面一则新闻，写一段结语，字数不超过60字。（4分）

上海《卢湾区迎世博双语指南》中，汉语注明英语发音。近日，各大论坛贴出《卢湾区迎世博双语指南》照片，《指南》中“早上好”被注音为“古的猫宁”，“对不起”被注为“俺么搔瑞”，引来网民热议。

昨天，发卡单位负责人称，此举是普及英语权宜之计，该卡已发放五万张。

结语：              

Traditional structured analysis techniques focus upon the flow of (36) within a system. Object-oriented analysis emphasizes the building of real-world models. It examines requirements from the perspective of the classes and objects found in the vocabulary of the (37) domain.
Traditional system design method emphasizes the proper and effective structure of a complex system. Object-oriented design method encompasses the process of object-oriented decomposition and a (38) for depicting both logical and physical as well as static and dynamic models of the system under design.
Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each of which represents an (39) of some class, and whose classes are all members of a hierarchy of classes united via (40) relationships.

A．mark

B．picture

C．symbol

D．notation

压缩机（）是降低排气量的主要因素之一。