下列各组物质的名称、俗名、化学式表示同一物质的是（   ）

A 氢氧化钠、纯碱、NaOH      B 氢氧化钙、生石灰、Ca（OH）2

C 氯化钠、食盐、NaCl        D 碳酸氢钠、小苏打、Na2CO3

The software architecture of a program or computing system is the structure or structures of the system, which comprise software （1）, the externally （2）properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a （3） that enables a software engineer to: analyze the （4）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（5） associated with the construction of the software.

（5）是（）

A.quality

B.budget

C.schedules

D.risks