单选题A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.Aengaged on pilotage dutyBin distressCat anchorDbeing overtaken in a narrow channel
单选题
A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.
A
engaged on pilotage duty
B
in distress
C
at anchor
D
being overtaken in a narrow channel
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