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在现实生活中，我们可能做过这样的实验：用燃着的烟头去点燃敞口容器里的少量汽油，令人难以置信的是竟不能将其点燃，难道烟头真的不能点燃汽油吗？那么，许多地方的禁烟措施不就没有必要了吗？究竟烟头能不能点燃汽油呢？大凡物质燃烧都必须具备一定的条件：必要条件和充分
In real life, we may have done such an experiment: Using a burning cigarette to ignite a small amount of gasoline in an open container is incredibly impossible to ignite. Can cigarette butts really not ignite petrol? So isn’t it unnecessary for smoking bans in many places? Can cigarette butts light petrol? All material combustion must have certain conditions: necessary conditions and sufficient