题型：问答题 You should have known waiting for you in the rain _____ more than one student, together with all the teachers!A. are B. was C. were D. is 查看答案
题型：问答题 回采工作面常见的顶板事故是冒顶事故。按一次冒落的顶板范围及伤亡人数多少，一般可分为( )事故两大类。A．局部冒顶和大面积切顶B．局部冒顶和切顶C．大面积冒顶和局部切顶D．局部或大面积冒顶和切顶 查看答案