quality iron ore concentrate
quality iron ore concentrate
优质铁矿精矿
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Owing to ore properties and other causes the quality of iron concentrate was not up to the standard and the enterprise Suffered heavy economic losses after concentrator put into operation.
七宝山硫铁矿选矿厂投产后，由于矿石性质等原因，铁精矿难以达标，经济严重受损。
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