If your vessel is underway in fog and you hear one prolonged and three short blasts，this is a （）.<br>A:vessel not under command<br>B:sailing vessel<br>C:vessel being towed (manned)<br>D:vessel being towed (unmanned)

If your vessel is underway in fog and you hear one prolonged and three short blasts，this is a （）.
A:vessel not under command
B:sailing vessel
C:vessel being towed (manned)
D:vessel being towed (unmanned)

出自：海船船员证

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