如图课堂上同学们利用图甲装置做过氧化氢分解实验时带火星的木条很难复燃于是老师加了一个u形管如图乙带火星的木条较易复燃.请回答下列问题 Template




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tomski如图课堂上同学们利用图甲装置做过氧化氢分解实验时带火星的木条很难复燃于是老师加了一个u形管如图乙带火星的木条较易复燃.请回答下列问题 coloring