问题
填空题
精馏塔主要用途是经初馏、酸洗、吹苯后的()再精馏塔内进行蒸馏,提取()。
答案
参考答案:混合分;纯产品
精馏塔主要用途是经初馏、酸洗、吹苯后的()再精馏塔内进行蒸馏,提取()。
参考答案:混合分;纯产品
选择合适的句子完成对话。 | |
B: 1_____________ You may ask that policeman over there. A: Thank you all the same. (The man goes to the policeman.) A: Excuse me. 2_____________ C: No, there isn't a hotel near here, but there is one near the Bank of China. A: 3_____________ C: It's about two kilometers (公里) away. A: 4_____________ C: You'd better take a taxi, because it's so late. There aren't any buses now. A: 5_____________ C: You' re welcome. |