单选题 0.625分

Which signal is recognized as a distress signal? ________.

  • A.Directing the beam of a searchlight at another vessel
  • B.A smoke signal giving off orange colored smoke
  • C.A whistle signal of one prolonged and three short blasts
  • D.International Code Signal PAN spoken over the radiotelephone

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  • A.call for help and keep the individual in sight
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  • A.before
  • B.with
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  • D.on