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Nafta, dabasgāze, akmeņogles, citas v...
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Nafta, dabasgāze, akmeņogles, citas vielas
Secondary schoolResearch Papers6 -
Ogļhidrāti, to uzbūve, vielas maiņas
Secondary schoolResearch Papers10 -
Virsmas aktīvas vielas
Secondary schoolResearch Papers14
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