While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.<br>A:not under command<br>B:being towed<br>C:on pilotage duty<br>D:aground

While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.
A:not under command
B:being towed
C:on pilotage duty
D:aground

出自：海船船员证

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