问题
问答题 简答题
简述回填料的组成及作用。
答案
参考答案：
回填料一般由石膏粉75％、膨润土20％、硫酸钠5％组成。
石膏粉用来保持水分，降低阳极接地电阻，膨润土是增强和土壤的紧密型，硫酸钠用来活化阳极表面，使阳极表面均匀腐蚀，提高阳极利用效率。
搜题请搜索小程序“爱下问搜题”
简述回填料的组成及作用。
参考答案：
回填料一般由石膏粉75％、膨润土20％、硫酸钠5％组成。
石膏粉用来保持水分，降低阳极接地电阻，膨润土是增强和土壤的紧密型，硫酸钠用来活化阳极表面，使阳极表面均匀腐蚀，提高阳极利用效率。
| 根据对话内容，从方框内选择合适的句子补全对话。（有两项多余） | |
| |
| M: Yang Liu, the summer holiday is over. (1)___________ W: I have visited the World Expo Garden in Shanghai. M: That must be exciting. (2)___________ You must have waited for a long time to visit some wonderful pavilions, didn't you? W: Yes, I did. But I think it's worth (值得) visiting. (3)___________ M: You're right. I want to go to the World Expo Garden, too. W: (4)___________ M: I'm planning to go during National Day holiday. W: (5)___________ M: The China Pavilion, of course. W: Have a pleasant trip.M: Thanks. |