coal centrifuge - 1 views
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cicemech on 06 Sep 24Mineral resources are the precious wealth endowed by nature and the material basis for social development and human survival. With the progress of society, the types and quantities of minerals used by human beings have increased dramatically. Over the past half-century, the world's mineral exploitation has exceeded the sum of the previous human history, and the types of minerals used have reached more than 170. Today, the development scale and utilization degree of mineral resources has become the main symbol to measure the material wealth, science and technology, and economic development of a country or region.