单选题One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.Ared star shellBsearchlightCburning barrelDorange smoke signal
单选题
One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.
A
red star shell
B
searchlight
C
burning barrel
D
orange smoke signal
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