本煤层预抽瓦斯抽放效果与原始煤体透气性和瓦斯（）有关。A、压_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

本煤层预抽瓦斯抽放效果与原始煤体透气性和瓦斯（）有关。

A、压力

B、温度

C、浓度

答案

参考答案：A

改错题

短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行做出判断：
     如有错误，（每行只有一个错误），则按下列情况改正：
     此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用横线划掉。
     此行缺一个词：在缺词处加一个漏词符号，在该行右边横线上写出该加的词。
     此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。

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问答题简答题

简述民法的概念及其基本原则。