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Advertising
The methods and act of calling something to the attention of the public especially through paid announcements. Also includes the business of preparing advertisements for publication or broadcast.
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銀
Chemistry; General chemistry
具有化學符號銀、 金屬化學元素與原子序數 47。柔軟的、 白的、 光澤的過渡金屬,它具有的任何元素的最高電導率和最高的熱導率的任何金屬。金屬自然地出現在黃金和其它金屬,合金作為其純,自由格式 (本機銀),和礦物銀礦和 chlorargyrite 等。大多數銀生產銅、 金、 鉛和鋅精煉的副產品。 ...