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据美国《采矿工程》杂志1986年第3期报道,全世界主要非金属矿产储量比较丰富,在和平环境里至少足够本世纪利用。现将16种非
According to the report of the United States “Mining Engineering” magazine published in 1986, the world’s major non-metallic mineral reserves are relatively abundant, and at least enough for peaceful use in this century in a peaceful environment. Now 16 kinds of non-