φράγμα, Κτίριο, αρχιτεκτονική, πηγή, δεξαμενή, νερό, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, ηλεκτρική ενέργεια, γεννήτρια, υδροηλεκτρική ενέργεια, παροχή ηλεκτρικού ρεύματος
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