#774469

#774469: What can be used as a natural grounding?

What can be used as a natural grounding?
Варианты ответа:
  • Metal pipes laid in the ground
  • Pipelines Sewerage
  • the Pipelines of Central heating
  • Any of the following pipelines

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Тематика: Основы безопасности жизнедеятельности Основы безопасности жизнедеятельности (ОБЖ) Основы электробезопасности
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