按发生冒顶事故的力学原因进行分类,可将煤层顶板事故分为压垮型冒顶、漏垮型冒顶、()。
参考答案:推垮型冒顶
- Ben, can you come to play football with us now?
- ________, but I have to wash the dishes first.
A.No, I can’t
B.I don’t want to
C.Yes, please.
D.I’d love to
现在学生宿舍都有引水机,为防止饮水机发生火灾,应注意什么