题目:
物质燃烧需要的三个条件是:有可燃物、可燃物与氧气接触和______.农村房屋起通常用水浇灭,其对应的灭火原理是:______.
答案:
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不唯一A possible version:Recently, we had a discussion on how to make learning English relaxing and fun. Most students believe that there are many ways to do so. First o...