单选题An orange flag showing a black circle and square is a（）.Asignal indicating a course changeBdistress signalCsignal of asking to communicate with another vesselDsignal indicating danger
单选题
An orange flag showing a black circle and square is a（）.
A
signal indicating a course change
B
distress signal
C
signal of asking to communicate with another vessel
D
signal indicating danger
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