问题
填空题
焦油加工的主要任务是获得酚、萘、蒽等纯产品和()等粗产品。
答案
参考答案:洗油沥青
焦油加工的主要任务是获得酚、萘、蒽等纯产品和()等粗产品。
参考答案:洗油沥青
补全对话。 | |
B: Certainly! But why are you going to plant trees? A: Why? 2. _____ B: Oh, yes. I remember. A: We must plant more trees and flowers to make our world more beautiful. B: 3. _____ Where shall we meet? A: At my home. You can help me take the trees. B: All right. When shall we come? A: At seven o'clock. 4. _____ B: OK, 5. _____ . | |