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......... is the basic raw material for the cement industry and essential for smelting iron ore in the blast furnace.

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......... is the basic raw material for the cement industry and essential for smelting iron ore in the blast furnace. 

(a) Gypsum 

(b) Limestone 

(c) Potash salt 

(d) Sodium salt

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Limestone is the basic raw material for the cement industry and essential for smelting iron ore in the blast furnace. 

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