12-Ma’ruza; Portlandsement. Ishlab chiqarish usullari, Quruq usulda kilinker pishirish
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Portlandsement. Ishlab chiqarish usullari, Quruq usulda kilinker pishirish.
Portlandsement. Ishlab chiqarish usullari, Quruq usulda kilinker pishirish.
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