通路工程中常用的是( )类基层。
A．二灰土
B．二灰矿渣
C．石灰煤渣稳定砂砾(碎石)
D．二灰碎石
参考答案：C
My teacher made me ____ at school yesterday because I didn't do [ ]
A. stayed
B. stay
C. to stay
D. staying
按光泽分下列哪种类型不是煤岩类型（）。
A.光亮型煤
B.半光亮型煤
C.半暗型煤
D.乌黑型煤
