煤层顶板,是指位于煤层上面的岩层,叫煤层顶板,煤层顶板还分成:伪顶、直接顶、基本顶。
参考答案:对
My new classmate told us about his trip to _____ Great Wall. He said it was _____ exciting experience for him. [ ]
A. the; an
B. /; the
C. the; /
D. /; a
装饰工程中属于装饰抹灰的有()。
A.水刷石
B.水磨石
C.斩假石
D.大理石