Смотровая яма и электричество
Привет !
при строительстве смотровой ямы необходимо ....
а что необходимо- смотрите ролик.
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![Теория узлов: от шнурков до новых молекул [Veritasium]](https://sun9-14.userapi.com/MA1uplnk7-fw72uTZ10CbbzFfY3l_2-MltTBFQ/dELJIgvm110.jpg)
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