Урок 20 - Канализация и водопречистване

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17y ago 23:44

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Канализация и водопречистване Вредни вещества, пречиствателни станции, изхвърляне на отпадъчни води: Как се пестим и да запазим водата чиста. Теми: канализация и водопречистване, опазване на околната среда

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