单选题A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.Avessel being towedBfishing vessel engaged in trawlingCvessel at anchor warning of her locationDpower-driven pilot vessel on station underway
单选题
A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.
A
vessel being towed
B
fishing vessel engaged in trawling
C
vessel at anchor warning of her location
D
power-driven pilot vessel on station underway
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