题目内容

计算机厂家在UNIX标准上分裂为两个阵营：一个是UNIX国际(UI)，以AT&T和Sun公司为首：另一个是______，以IBM、HP、DEC公司为首。

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与V面平行的直线，称为______。

IEEE802.11的MAC层采用的是______的冲突避免方法。

正平线的______投影反映直线的实长。

The software architecture of a program or computing system is the structure or structures of the system, which comprise software, the externally properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a that enables a so, ware engineer to: analyze the of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the __ associated with the construction of the software.

A. quality
B. budget
C. schedules
D. risks