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Voda
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Poznáme tieto druhy vôd:
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Na úpravu vody používame:
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Čo odstránime z vody filtráciou?
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Čo sa ukladá na dne usadzovacích nádrží?
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Vodu môžeme dezinfikovať:
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Prevzdušňovanie pri úprave odpadovej vody slúži na:
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Napíšte päť príkladov zdrojov znečistenia vody
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