合成高分子防水涂料以( )为主要成膜物质。 A.橡胶或沥青 B.橡胶或合成树脂 发布时间:2017-12-31 04:13 │ 来源:www.tikuol.com 题型:单项选择题 问题: 合成高分子防水涂料以( )为主要成膜物质。A.橡胶或沥青 B.橡胶或合成树脂 C.沥青或合成树脂 D.沥青或纤维
题型:单项选择题 ---Do you have any news about Bob? ---Yeah. We ______ each other quite a lot recently.[ ]A. have been seeingB. had been seeingC. seeD. have seen 查看答案