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TEST perspicacitate: Becul „inteligent”. Cum poate să lumineze acest bec?
Unele imagini pot să fie înşelătoare...
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Becul din imaginea de mai jos produce o lumină albă normală și este alimentat de la o sursă de curent alternativ, ca oricare bec. El produce lumină, chiar dacă fasungul nu este înfiletat în dulie. Gândiți-vă cum este posibil… Răspunsul, mai jos
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