Ce este un sonar?
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V-ați gândit vreodată ce înseamnă cuvântul sonar? Potrivit surselor oficiale, acest cuvânt vine de la primele litere ale expresiei „navigaţie variabilă de sunet”. Potrivit http://www.descopera.ro, începând de la ecou, sonarul seamănă cu radarul. Atunci când un sunet se întoarce de la un obiect mare, numim această reacţie „ecou”. Atunci când semnalul radio revine de la […]
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