Glass is made of mixture of many substances melted together in a large furnace. The most important substance is silica which is

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问题 Glass is made of mixture of many substances melted together in a large furnace. The most important substance is silica which is found in sand. Potash (钾碱), obtained from wood-ashes, is also necessary. To these two substances are added lime, lead, soda

选项

答案acides are used

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大学英语三级B级

大学英语三级

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Glass is made of mixture of many substances melted together in a large furnace. The most important substance is silica which is

大学英语三级B级

大学英语三级

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