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алуминијум-оксид
Small quantities of aluminium oxide or alumina can be added to batch recipe to improve glass durability and mechanical strength. Aluminium oxide also raises the viscosity and decreases the likelihood of devitrification, which can lead to strains and cracking.
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A body of relatively still fresh or salt water of considerable size, localized in a basin that is surrounded by land. Lakes are inland and not part of ...
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