问题
判断题
监测环境空气中气态污染物时，要获得1h的平均浓度，样品的采样时间应不少于30min。
答案
参考答案：错
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监测环境空气中气态污染物时，要获得1h的平均浓度，样品的采样时间应不少于30min。
参考答案：错
| 阅读下面的短文，按信息表中的要求填写信息。 | ||||||||||||||
| My name is Li Hua. Jack is my good friend. Before he started high school, he used to spend a lot of time playing games with me. But now he is always busy. He used to like doing sports, but now he likes painting very much. He used to be on the basketball team. Now, he is a member of an art club. He used to be afraid of swimming, but now he is a good swimmer. His parents said they used to do the same thing when they were children. When his parents were children, they used to play games with their friends and like sports very much. So Jack and his parents are good friends. | ||||||||||||||
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