In reduced visibility，you hear two prolonged blasts of a whistle. This signal is sounded by a （）.<br>A:power-driven vessel dead in the water<br>B:sailing vessel on the port tack<br>C:vessel not under command<br>D:vessel fishing with nets

In reduced visibility，you hear two prolonged blasts of a whistle. This signal is sounded by a （）.
A:power-driven vessel dead in the water
B:sailing vessel on the port tack
C:vessel not under command
D:vessel fishing with nets

出自：海船船员证

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