连接管路用密封垫圈厚度,通常规定为()。A.l~l.4mm B.1.5~2mm C. 发布时间:2019-10-25 04:43 │ 来源:www.tikuol.com 题型:单项选择题 问题: 连接管路用密封垫圈厚度,通常规定为()。A.l~l.4mmB.1.5~2mmC.1.5~2.5mm
题型:单项选择题 There _____ on the wall. They are very beautiful.[ ]A. are photoes B. are photosC. is a photo D. is photos 查看答案