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氧气的制取是初中化学的重点,也是历年中考的热点.我们不仅要学好氧气制取的知识,而且要触类旁通,逐步掌握实验室制取气体的一般思路和方法.综观2007年
The preparation of oxygen is the focus of junior high school chemistry, and it is also a hot spot in the annual examination. We must not only learn the knowledge of oxygen production, but also comprehend the bypass and gradually master the general ideas and methods for the preparation of gas in the laboratory.