降低机动车混合气的空燃比，柴油机的CO和碳烟浓度就会降低。
参考答案：错
解析：增加机动车混合气的空燃比，因有充分的氧气，柴油机的CO和碳烟浓度就会降低。
用所给单词的适当形式填空。
1. Thanks for ____________ (send) me the snow globe of the monster.
2. Have you finished ____________ (write) your story?
3. Alison is always the first student ____________ (get) to school.
4. Every year ____________ (thousand) of foreigners come to visit Mount Tai.
5. There are a lot of old ____________ (build) in Beijing. They are very beautiful.
经常巡视有以下几种目的：（）
A.确认管理结果
B.可以把握真实信息
C.可以发现新情况
D.增进上下级的沟通
