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0:15 1 Zvučnici 1 Poglavlja 7 segmenti
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Zvučnici

Poglavlja

  1. 0:01
    Poglavlje 1: How can we identify the best solution? 13s · Speaker 1

    How can we identify the best solution? A. We may want to consult some experts. B. Everyone must show identification. C. In the laboratory.