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问题 选择题

若两个相似三角形的面积之比为1：4，则它们的周长之比为（　　）

A．1：2

B．1：4

C．1：5

D．1：16

答案

∵两个相似三角形的面积之比为1：4，

∴它们的相似比为1：2，

∴它们的周长之比为1：2．

故选A．

选择题

日本明治维新与中国洋务运动的相似点有

①都是在内忧外患的背景下实施的改革 ②目的是富国强兵

③都学习和引进西方先进的政治经济制度以及文化④都使本国的社会性质发生根本转变 [ ]

A．①②         

B．②③          

C．③④         

D．①③

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单项选择题

Representations of software architecture are an enabler for communication between all parties (stakeholders) interested in the development of a computer-based system. An architectural style defines as a family of suchsystems in terms of a ______ of structural organization. More specifically, each ______ describes a systemcategory that encompasses: (1) a set of components (e.g., a database, computational modules) that perform afunction required by a system, (2) a set of ______ that enable "communication, coordination andcooperation" among components, (3)______ that define how components can be integrated to form thesystem, and (4) semantic models that enable a designer to understand the overall properties of a system byanalyzing the known ______ of its constituent parts.

A. style B. phase C. charter D. schedule
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