第16题: [单项选择]What do we know about the speaker’s friend A. He was once a friend of the ruler. B. He was a tax collector. C. He was a government official. D. He was once a school teacher in India. 参考答案:D 答案解析:[听力原文]19-21
A friend of mine told me that when he was a young man, be went to work as a teacher
第17题: [多项选择]原料中断的处理原则有()。 A. 降量操作 B. 改闭路循环 C. 装置停工 D. 提高蒸发段温度 参考答案:A, B, C