6.下列有关化学实验过程中的操作错误的是a.给试管加热必须先预热b.将固体溶解的时候要用玻璃棒不断的搅拌c.点燃氢气前一定要先检验氢气的 Template




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tomski6.下列有关化学实验过程中的操作错误的是a.给试管加热必须先预热b.将固体溶解的时候要用玻璃棒不断的搅拌c.点燃氢气前一定要先检验氢气的 coloring