专用排瓦斯巷内必须安设甲烷传感器,甲烷传感器应悬挂在距专用排瓦斯巷回风口()m处。
A.5
B.10
C.15
D.12
参考答案:C
If you are not familiar ____ the topic, you may write something that is familiar ____ you. [ ]
A. with; with
B. to; to
C. to; with
D. with; to
安全建设整改以()为驱动,采用的安全技术措施、以及配套的安全管理措施等均应满足信息系统的基本安全需求为目的。