(1)铁丝在氧气中燃烧时,放出大量的热,能使铁丝熔化.所以,在做铁丝在氧气中的燃烧实验时,集气瓶底要放少量的水或沙,这是为了( )用排水法收集氧气时,集气瓶内必须先盛满水,在水槽中
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![(1)铁丝在氧气中燃烧时,放出大量的热,能使铁丝熔化.所以,在做铁丝在氧气中的燃烧实验时,集气瓶底要放少量的水或沙,这是为了( )用排水法收集氧气时,集气瓶内必须先盛满水,在水槽中](/uploads/image/z/1457490-66-0.jpg?t=%EF%BC%881%EF%BC%89%E9%93%81%E4%B8%9D%E5%9C%A8%E6%B0%A7%E6%B0%94%E4%B8%AD%E7%87%83%E7%83%A7%E6%97%B6%2C%E6%94%BE%E5%87%BA%E5%A4%A7%E9%87%8F%E7%9A%84%E7%83%AD%2C%E8%83%BD%E4%BD%BF%E9%93%81%E4%B8%9D%E7%86%94%E5%8C%96.%E6%89%80%E4%BB%A5%2C%E5%9C%A8%E5%81%9A%E9%93%81%E4%B8%9D%E5%9C%A8%E6%B0%A7%E6%B0%94%E4%B8%AD%E7%9A%84%E7%87%83%E7%83%A7%E5%AE%9E%E9%AA%8C%E6%97%B6%2C%E9%9B%86%E6%B0%94%E7%93%B6%E5%BA%95%E8%A6%81%E6%94%BE%E5%B0%91%E9%87%8F%E7%9A%84%E6%B0%B4%E6%88%96%E6%B2%99%2C%E8%BF%99%E6%98%AF%E4%B8%BA%E4%BA%86%EF%BC%88+%EF%BC%89%E7%94%A8%E6%8E%92%E6%B0%B4%E6%B3%95%E6%94%B6%E9%9B%86%E6%B0%A7%E6%B0%94%E6%97%B6%2C%E9%9B%86%E6%B0%94%E7%93%B6%E5%86%85%E5%BF%85%E9%A1%BB%E5%85%88%E7%9B%9B%E6%BB%A1%E6%B0%B4%2C%E5%9C%A8%E6%B0%B4%E6%A7%BD%E4%B8%AD)
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