单词：phenolic putty
酚醛腻子
单词：phenolic putty 相关文章
Lesson 8 A LUMP OF PUTTY 第八课 一块腻子（油灰） Did you ever see a man put in a pane of glass? He first cuts away the hard stuff which holds the old glass in its place. This hard stuff is called putty. Then with some fresh putty he fixes
发表于:2018-12-18 / 阅读(136) / 评论(0)
英国学生科学读本
英国学生科学读本
Lesson21 A piece of slate 第21课 一块石板 Look at your slate, and see what it is made of. It is a very thin, smooth, grey stone. The pencil with which you write upon it is also a piece of soft slate. 小朋友, 看看你自己写字用的石板
发表于:2019-02-13 / 阅读(170) / 评论(0)
英国学生科学读本
英国学生科学读本