Четыре плакатаКлассификация систем заземления
Защитное уравнение потенциалов
Сечение проводников
Формирование систем заземленияИздательство СОУЭЛО.
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Language: Russian
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Tags: Безопасность жизнедеятельности и охрана труда;Плакаты и знаки по БЖД и ОТ