洁净厂房内洁净室和疏散走道的顶棚的耐火极限分别不应低于()。 A.0.25h和1.0 发布时间:2018-01-27 15:35 │ 来源:www.tikuol.com 题型:单项选择题 问题: 洁净厂房内洁净室和疏散走道的顶棚的耐火极限分别不应低于()。A.0.25h和1.0hB.0.4h和1.0hC.0.5h和0.5hD.1.0h和0.5h
题型:单项选择题 The maths problem is very difficult. I work it out, _____. [ ]A. still B. yet C. although D. though 查看答案