用盐酸萘乙二胺法测定空气中NOx时，所用氧化管的最适宜相对湿度_爱下问搜题

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问题填空题

用盐酸萘乙二胺法测定空气中NOx时，所用氧化管的最适宜相对湿度范围为（）。若氧化管中的三氧化铬变成氧化铬时（）应（），若氧化管中氧化剂板结或变成绿色，表示其中氧化剂（）。使用这样的氧化管不仅影响（）同时还会影响（）效率。

答案

参考答案：30%-70% ；氧化剂；更换；失效；流量；氧化

完形填空

The Catherine family enjoyed the good things in life as much as anyone else. They ____ games, books, music, toys, good food and good times. But sometimes _____seemed, especially to Mrs. Catherine that they had too many things in the house, which made Mrs. Catherine a little ____.
One day, at breakfast, Mrs. Catherine made a(n) __  _. "This family," she said, "has too many things. It's time to deal with some of them. "The three children all _____with this idea and helped pack used things and unused things into the car.
Their first __    _was Home for the Elderly. Nurses and doctors looked after them, but sometimes the older got a little lonely and ____. They liked visitors and things to do. When
the family arrived, they ____out their games and puzzles to the older and then sat down to play games and do puzzles with them. They had a _____time and they were sorry when it was time to leave.
Their next stop was the Young Cubs Hospital. The Catherine family brought a lot of used toys which were very welcome. The hospital workers said the toys would be given out at the hospital _____party.
Their last stop was People Who Care store. This was a store that sold things to _____money for those who needed warm clothes and good food. The Catherine family left all their old clothes and furniture there.
After that, the Catherine family __  _home with warm feelings about what they had done. _____they drove along, they passed the lighted _____of supermarkets which were beautifully decorated for Christmas. There was window after window of the very latest things, but they were so filled with special thoughts about helping others that they ___noticed the wonderful things in the windows.

A．uncomfortable

A．Thanksgiving

D．immediately

填空题

其土地使用年限按国家规定执行。即：居住用地（）年；工业用地（）年；教育、科技、文化、卫生、体育用地（）年；商业、旅游、娱乐用地（）年；综合用地或者其他用地（）年。