化学是一门以实验为基础的自然�学。实验帮助�们研究物质的组成(1)如图用红磷燃烧的方法测定空气中氧气的体积分数。�红磷熄灭后,集气瓶冷却至室温 Template


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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


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tomski化学是一门以实验为基础的自然�学。实验帮助�们研究物质的组成(1)如图用红磷燃烧的方法测定空气中氧气的体积分数。�红磷熄灭后,集气瓶冷却至室温 coloring