问题
问答题
铁丝在氧气中燃烧实验中，集气瓶底部为什么要先放些水或铺一层细沙？
答案
铁丝在氧气中燃烧生成的四氧化三铁固体温度很高，溅落到集气瓶瓶底时容易把瓶底炸裂，在集气瓶底部先放些水或铺一层细沙的目的是：防止溅落的四氧化三铁固体炸裂集气瓶．
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铁丝在氧气中燃烧实验中，集气瓶底部为什么要先放些水或铺一层细沙？
铁丝在氧气中燃烧生成的四氧化三铁固体温度很高，溅落到集气瓶瓶底时容易把瓶底炸裂，在集气瓶底部先放些水或铺一层细沙的目的是：防止溅落的四氧化三铁固体炸裂集气瓶．
| 用所给单词和短语的适当形式填空。 | |
2. The ____ to the movie was five dollars. 3. This new invention will bring you great ____ like a goldmine. 4. This is the school that ____ a hero where he spent his childhood. 5. On the outskirts of the city, we saw many ____ bungalows (平房). 6. Coral is not a plant but animal life of ____ different shapes and bright colours. 7. Our train ____ Beijing Station on time. 8. Just imagine how horrible the world would be if' human is the only ____ in the world. 9. Take a camera and ____ the nature in your summer holiday. 10. We're in the ____ more people are against us than with us. |