用锚杆将软弱的直接顶板吊挂于其上的坚固老顶上称为悬吊作用。 发布时间:2017-10-25 12:14 │ 来源:www.tikuol.com 题型:判断题 问题: 用锚杆将软弱的直接顶板吊挂于其上的坚固老顶上称为悬吊作用。
题型:判断题 Mr. Li is a famous writer , he already four books . And they all sell well now. [ ]A. has, written B. have , written C. has , write D. has wrote 查看答案