第17题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. Learning from the mistakes. B. Always trying to find out the things. C. Keeping high spirits even after he fails. D. Having a peculiar outlook on life. 参考答案:D 答案解析:[听力原文]
Which of the following is not a characteristic of intelligent people
第18题: [单项选择]焦点的极限分辨率(R)的叙述,错误的是() A. R是在规定测量条件下不能成像的最小空间频率值 B. 线量分布为单峰时R大 C. 线量分布为多峰时R小 D. R值小的焦点成像性能好 E. 焦点尺寸小R大 参考答案:D 答案解析: