题型:填空题 分4组,任选一组作答。每题的备选项中,只有1个最符合题意。矿山安全技术( )和制定具体的安全技术操作规程,建立正常的生产和作业制度,是防治顶板事故的重要措施。A.选用合理的采矿方法B.搞好地质调查工作C.及时处理采空D.加强工作面顶板的支护与维护 查看答案
题型:填空题 He bought some books in the bookstore and his father________ him a lot of money.A.givesB.will giveC.ought to giveD.must have done 查看答案