单选题 0.625分

You are on international waters during a heavy rainstorm and' hear a vessel sounding a fog signal of...

You are on international waters during a heavy rainstorm and' hear a vessel sounding a fog signal of one prolonged blast followed by two short blasts. Which of the following could it be?① A vessel laying submarine cable making way ②A pilot vessel on station at anchor
  • A.① only
  • B.② only
  • C.Either ① or ②
  • D.Neither ① nor ②

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