第4题: [单项选择]燃气的需用工况系指用户的( )。 A. 变化规律 B. 增长情况 C. 使用时长 D. 接受程度 参考答案:A 答案解析:本题的考点是燃气需用工况的概念。燃气的需用工况系指用户的变化规律。各类用户对燃气的用量随时间而变化,一年中各月、各日、各时均不相同。用户的不均匀性与确定气源生产规模、调峰手段和输配管网管径有很密切的关
第20题: [单项选择]A.He hasn’t eaten well recently. B.He’s been helping his sister a lot. C.He can’t stop searching for work yet. D.He’s been working on his paper constantly. 参考答案:D 答案解析:[听力原文] W: I can’t stop thinking about my research. M: Neither can I. I am working on my thesis