影响蒸发浓缩的因素包括( ) A．冷凝器中二次蒸气的压力 B．加热蒸气的压力 C． 发布时间：2017-05-03 08:30 │ 来源：www.tikuol.com 题型：多项选择题 问题： 影响蒸发浓缩的因素包括( )A．冷凝器中二次蒸气的压力B．加热蒸气的压力C．管内垢层热阻D．管间蒸气冷凝传热系数E．管壁热阻
题型：多项选择题 阅读理解。To: wangle@126.comFrom: Li FangSubject: Books on sale Hello, Wang Le. There will be some books on sale in the bookstore behind No. 13 Middle School on the morning of June 21st. There will be many kinds of books: books on history, physics, science and art at that time. There are also books on your favorite subject computer. After the English exam, I want to buy some books there and want to know whether you would like to go with me. Please let me know as soon as possible. 1. What's the subject of this e-mail? A. Books on sale. B. Invitation to a party. C. Going shopping 2. Li Fang will buy some books _____. A. after the English exam B. before the English exam C. after the physics exam 3. What's Wang Le's favorite subject? A. History. B. Computer. C. Science 4. Will Wang Le go to the bookstore with Li Fang? A. We don't know. B. Yes, he likes it. C. No, I don't think so. 5. From the passage we know _____.A. they are friends B. they are strangers C. they are mother and son 查看答案