学完氧气的性质后为加深对所学知识的认识某同学设计了如下实验根据实验回答问题1取一瓶氧气倒立过来后再拿走玻璃片并立刻把带火星的木 Template




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tomski学完氧气的性质后为加深对所学知识的认识某同学设计了如下实验根据实验回答问题1取一瓶氧气倒立过来后再拿走玻璃片并立刻把带火星的木 coloring