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We need oxygen in air to maintain our lives.Moreover,oxygen facilitates burning.If there is no oxygen,a fire goes out.Fires can be put out using this principle.
题目详情
We need oxygen in air to maintain our lives.
Moreover,oxygen facilitates burning.If there is no oxygen,a fire goes out.Fires can be put out using this principle.
Moreover,oxygen facilitates burning.If there is no oxygen,a fire goes out.Fires can be put out using this principle.
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答案和解析
我们需要氧气来维持生命.并且,氧气可以助燃.如果没有氧气,任何火焰都将熄灭.因此,可以用此原理灭火.
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