Air-entraining agent increases impermeability of hybrid fiber concrete.引气剂有助于提高混杂纤维混凝土的抗渗性。Even an air - entraining agent can be used because the minute pores are discontinuous.甚至可以使用加气剂,因为小的气孔是不连通的.Third, the option of ...
Manufacturers of the early 1900 s were using steel pipe, angle or channel for the greenhouse superstructures.二十世纪初期制造商们就已用钢管 、 角铁以及槽钢之类的材料建造温室的上部结构.Ships, Offshore and Marine Strutures : Above and below - water hull area...
主题是教师, 总统将宣布今年获奖的教师.The subject is teachers. He's announcing the teacher of the year.她获奖的小说被登在报上.Her prize novel was printed in the newspaper.获奖的外国留学生由北航国际学院颁发相应的获奖证书.Scholarship and certificates will be awarded to ...