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问题 选择题

已知-25a2mb和7a4b3-n是同类项，则2m-n的值是（　　）

A．6

B．4

C．3

D．2

答案

由题意得：2m=4，3-n=1，

解得：m=2，n=2，2m-n=2．

故选D．

单项选择题

工程项目建设的各阶段对工程项目最终质量的形成都产生重要影响，其中项目决策阶段是( )。

A．确定项目质量．目标与水平的依据

B．确定项目应达到的质量目标与水平

C．将项目质量目标与水平具体化

D．确定项目质量目标与水平达到的程度
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单项选择题 共用题干题

An architectural style defines as a family of such systems in terms of a (1) of structural organization. More specifically, an architectural style defines a vocabulary of (2) and connector types, and a set of (3) on how they can be combined. For many styles there may also exist one or more (4) that specify how to determine a system's overall properties from the properties of its parts. Many of architectural styles have been developed over the years. The best-known examples of (5) architectures are programs written in the Unix shell.

空白（1）处应选择（）

A.pattern

B.data flow

C.business process

D.position level
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