完成下列问题鉴别氧气空气和氮气三种气体最简便的方法是 A用一根带火星的木条 B用一根燃着的木条 C用澄清的石灰水请用实验的方法证明食盐 Template




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tomski完成下列问题鉴别氧气空气和氮气三种气体最简便的方法是 a用一根带火星的木条 b用一根燃着的木条 coloring