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Friday, April 9, 2010
火药的解释
火药是一个黑或棕色的炸药。火药是从硫磺、木炭跟硝酸钾合成起来。火药的燃烧很迅速,所以火药是个很重要配料在烟火和枪支。
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火药
火药对中国的重要
火药的解释
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