已知a-2b=5,则2a-4b-5a-2b的值( ) A.9 B.-3 C.-15 D. 发布时间:2017-05-18 01:19 │ 来源:www.tikuol.com 题型:选择题 问题: 已知a-2b=5,则2a-4b-5a-2b的值( )A.9B.-3C.-15D.无法确定
题型:选择题 The Shenzhou Ⅶ safely landed in China's northern grassland _____ flying in space for about 68 hours. [ ]A. before B. after C. and D. so 查看答案