Забавный тест моторного масла “по немецки“
Забавная конструкция машинки трения и тест масла, но даже не зная немецкого языка все более,чем показательно
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![Как работает Электронный Микроскоп? Фотографируем атомы [Branch Education на русском]](https://sun9-53.userapi.com/bLjQbBK4Oq_iR77bVgU90netMQDZrNgN58Asng/OvQ6SnX_zC8.jpg)
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