单选题If your vessel is underway in fog and you hear one prolonged and three short blasts，this indicates a（）.Avessel not under commandBsailing vesselCvessel in distressDvessel being towed
单选题
If your vessel is underway in fog and you hear one prolonged and three short blasts，this indicates a（）.
A
vessel not under command
B
sailing vessel
C
vessel in distress
D
vessel being towed
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