![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[单选题]
回风流中机电设备硐室的进风侧瓦斯传感器报警浓度为()
A.0.5%
B.0.6%
C.0.8%
D.0.3%
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.0.5%
B.0.6%
C.0.8%
D.0.3%
第4题
A.≥0.5%CH4,≥0.5%CH4,<0.5%CH4
B.≥1.0%CH4,≥1.5%CH4,<1.0%CH4
C.≥1.5%CH4,≥1.5%CH4,<1.5%CH4
D.≥1.5%CH4,≥2.0%CH4,<1.5%CH4
第6题
A.≥0.5%CH4、≥0.5%CH4、≤0.5%CH4
B.≥0.7%CH4、≥0.7%CH4、≤0.7%CH4
C.≥1.0%CH4、≥1.0%CH4、≤1.0%CH4
D.≥1.5%CH4、≥1.5%CH4、≤1.5%CH4
第7题
A、≥0.5%CH4;≥0.5%CH4;≤0.5%CH4
B、≥0.7%CH4;≥0.7%CH4;≤0.7%CH4
C、≥1.0%CH4;≥1.0%CH4;≤1.0%CH4
D、≥1.5%CH4;≥1.5%CH4;≤1.5%CH4
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!