A distress signal（）.<br>A:consists of 5 or more short blasts of the fog signal apparatus<br>B:consists of the raising and lowering of a large white flag<br>C:may be used separately or with other distress signals<br>D:is used to indicate doubt about another vessel's intentions

A distress signal（）.
A:consists of 5 or more short blasts of the fog signal apparatus
B:consists of the raising and lowering of a large white flag
C:may be used separately or with other distress signals
D:is used to indicate doubt about another vessel's intentions

出自：海船船员证

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