A. 生活排水系统 B. 工业废水排水系统 C. 屋面雨水排除系统 D. 卫生器具排水系统
A. 东 B. 西 C. 南 D. 北
A. 对 B. 错
A. S B. R C. T D. U
A. Enjoy yourself B. It's a pleasure C. Good luck D. very good
A. What size do you wear? B. What can I do for you? C. How about this one. D. What size does your father wear?
A. It's OK with me B. It doesn't matter C. Don't be sorry D. I don't care