城市垃圾、厕所、污水沟等属于( )。
A．农业污染源 B．交通污染源C．生活污染源 D．工业污染源
参考答案：C
In requirements engineering, requirements elicitation is the practice of collecting the requirements of a system from users, customers and other stakeholders. In the following practices, ( ) is rarely used in requirements elicitation.
A. brain storming
B. interview
C. questionnaire
D. Monte Carlo analysis
造成掘进工作面瓦斯积聚的原因有（）
A、局部通风管理不善
B、现场管理失控出现空班漏检
C、遇地质条件变化
D、高瓦斯矿井
