加油站员工有必要的知识技能，规范作业，能为顾客解决疑难问题，这表明加油站的服务符合规范化和技能化的优质服务测定标准。
参考答案：对
由于声阻抗不同，声波从空气达内耳淋巴液时所衰减的能量约为（）
A.10dB
B.20dB
C.30dB
D.40dB
E.50dB
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．blackbox
B．business rule
C．use case
D．traceability matrix
