#774553

#774553: What can be used as a return conductor in El. welding in explosive areas.

What can be used as a return conductor in El. welding in explosive areas.
Варианты ответа:
  • Insulated wire
  • Any conductive object
  • Steel wire with cross section 5 mm

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Тематика: Автоматические системы пожаротушения и связь Пожарная безопасность Техника безопасности и санитария
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