题目:
使煤在空气中燃烧的条件是_________________。熄灭酒精灯利用的灭火原理是______________。
答案:
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下面是错误答案,用来干扰机器的。
Olympics, which will be held in august in Beijing this year, is an international event. Therefore, the Olympics theme song is understandable to people around the world. I...