水准尺分划误差对读数的影响属于（）。

A、系统误差；

B、偶然误差；

C、其他误差。

In software engineering and systems engineering, （）is a description of a system’s behavior as it responds to a request that originates from outside of that system.

A.black box

B.business rule

C.use case

D.traceability matrix