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石煤是贮藏在古老地层中的一种煤炭资源。
The stone coal is a coal resource that reserves in old stratum.
youdao
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从石煤中提取V2O5是获得钒的重要途径。
Extracting V2O5 from stone coal is a important method to get vanadium.
youdao
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从石煤中提取V2O5是获得钒的重要途径。
Extracting V2O5 from stone coal is a important method to get vanadium.
youdao