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