单选题A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.AfishingBin distressCat anchorDnot under command
单选题
A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.
A
fishing
B
in distress
C
at anchor
D
not under command
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