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Chemistry, 28.06.2019 08:30 chloe4740

Ce procent de impuritati contine un minereu de siderit, daca din 1500kg minereu s-au obtinut 700kg fier 90% ?

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Ce procent de impuritati contine un minereu de siderit, daca din 1500kg minereu s-au obtinut 700kg f...

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