单选题Which signal is recognized as a distress signal?（）ADirecting the beam of a searchlight at another vesselBA smoke signal giving off orange colored smokeCA whistle signal of one prolonged and three short blastsDInternational Code Signal PAN spoken over the radiotelephone
单选题
Which signal is recognized as a distress signal?（）
A
Directing the beam of a searchlight at another vessel
B
A smoke signal giving off orange colored smoke
C
A whistle signal of one prolonged and three short blasts
D
International Code Signal PAN spoken over the radiotelephone
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