地面铺轨前,应先铺设底砟,其厚度不小于()。A.7cm B.8cm C.9cm D. 发布时间:2017-10-22 23:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: 地面铺轨前,应先铺设底砟,其厚度不小于()。A.7cmB.8cmC.9cmD.10cm
题型:单项选择题 He ______ the test again, in which case, his mother will be very disappointed. A.might failB.must have failedC.should failD.could have failed 查看答案
题型:单项选择题 —Is the football under the chair? —________. It's behind the door. A. YesB. No C. OK D. No, I can't 查看答案