Očkování. (2.) Objasnění energetických polarit
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![prof. Matolín: Vodík - palivo pro udržitelnou energetiku [Fyz. čtvrtek – online]](https://sun9-72.userapi.com/tq7kBQoqlu6cYrcQHHqqiRz5x6-btG2ZB11vxw/6st57LaiHe4.jpg)
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