题目: 目前开采金属矿主要采用的采矿方法有()三种。A.空场采矿法、充填采矿法、崩落采矿法B.空场采矿法、壁式采矿法、充填采矿法C.空场采矿法、留矿采矿法、分段崩落法D.房柱采矿法、分层崩落法、充填采矿法 答案: 参考答案:A
题型:选择题 The hunter insisted that he _____ a tiger and that a searching team ______ to hunt for it.A.has seen; be set upB.had seen; be set upC.saw; would be set upD.should see; should be set up 查看答案