以下是空气污染指数与质量级别、质量状况的对应关系: 空气污染指数 0~50 51~100 101~200 201~300 >300 空气质量状况 优 良 轻度污染 中度污染 重度污染 空气质量级别 I II III IV V 2006年10月17日,无锡市区的空气污染指数为58,首要污染物为:可吸入颗粒物。根据以上信息,判断无锡市区当天的空气质量级别和空气质量状况分别是
【简答题】完形填空。 I'll never forget that summer day in 1965 when my mother suddenly died. Later that after-noon, a police officer came to ask my father' s permission (允许) for the hospital to 1 mother's valve (心脏瓣...
【简答题】根据句意及首字母提示写出所缺单词。 1. Only two rulers are red, the r_____ are yellow. 2. I'm worried about the s_____ of the children because they've never been there before. 3. Don't b_____ your father now. He's work...
【简答题】A man asked his father-in-law , “ Many people praised you for a s uccessful marriage. Could you please share with me your secret? ” The father-in-law answered with a smile , “ Never c riticize your wi...