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You are the first vessel to arrive at the scene of a distress. Due to the volume of traffic on the radio，you are unable to communicate with the vessel in distress. Which action should you take?（）
A:Switch to flag hoists
B:Broadcast "Seelonce Distress"
C:Broadcast "Charlie Quebec-Mayday-Quiet"
D:Key the microphone three times in quick succession

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出自：海船船员证

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