钻孔爆破法掘进水平卷道时,施工的第一道工序是()A、钻孔 B、爆破 C、支护 发布时间:2020-02-12 01:48 │ 来源:www.tikuol.com 题型:单项选择题 问题: 钻孔爆破法掘进水平卷道时,施工的第一道工序是()A、钻孔B、爆破C、支护
题型:单项选择题 There is in today’s homework. A.difficult nothing B.difficult anything C.nothing difficultD.anything difficult 查看答案