第3题: [多项选择]关于分馏塔设置多段循环回流,说法中错误的是()。 A. 在两个侧线中间设置回流可以降低顶回流负荷 B. 各段回流除了取走多余的热量,还担负着控制质量的目的 C. 油浆循环温度高,为了提高热量利用率,油浆取热量越大越好 D. 使用顶循环回流比冷回流可以降低塔顶部的冷却负荷 参考答案:B, C
第33题: [单项选择]What did the woman do this morning A. She had the cooker changed. B. She had her cooker repaired. C. She bought a new cooker. D. She returned her new cooker. 参考答案:A 答案解析:M: What’’s wrong with your new electric cooker Let me see if I can fix it.
W: Oh, I had the shop r