九上化学《空气》名师精讲

《空气》学而思名师精讲1https://v.qq.com/txp/iframe/player.html?vid=w0173yot0bx&width=500&height=375&auto=0《空气》学而思名师精讲2https://v.qq.com/txp/iframe/player.html?vid=a01731wvgbq&width=500&height=375&auto=0

《我们周围的空气》四中名师精讲https://v.qq.com/txp/iframe/player.html?vid=t051287ra5z&width=500&height=375&auto=0

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