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0:15 1 Kõnelejad 1 Peatükk 7 segmendid
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Kõnelejad

Peatükk

  1. 0:01
    Peatükk 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.