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麻雀啦啦啦 @kg1243258409-07-2018
银是一种比较活泼的贵重金属，在空气中极易与硫或硫化氢反应而生成黑色的硫化银。这就是为什么银首饰在使用后会出现 发鸟变黑...more
http://www.zbird.com/e-education/20339.html
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