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Silicon Dioxide - Answers.com - Answers - The Most Trusted Place for Answering Life's Questions
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日期：2025-10-05
no "Silica, also known as silicon dioxide, is a compound made out of the two most abundant elements in the Earth's crust, silicon and oxygen (SiO2). Silica has three main crystalline varieties: quartz (by far the most abundant), tridymite, and cristobalit...看更多
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