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

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

出自：海船船员证

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