煤矿三大规程是指：（）
A、煤矿安全规程
B、爆破规程
C、作业规程
D、操作规程
参考答案：A, C, D
---Did the actor live alone in the house?
---Yes. He has a wife and two children. But ____ of them live with him.
A．none
B．all
C．both
D．no one
收集和观察岩屑并恢复地下地质剖面的过程，称为（）录井。
A、岩心
B、岩屑
C、钻时
D、钻井液
