Which statement is TRUE concerning the danger signal?（）.<br>A:When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal<br>B:Only the stand-on vessel can sound the danger signal<br>C:Distress signals may be used in place of the danger signal<br>D:The danger signal consists of 4 or more short blasts of the whistle

Which statement is TRUE concerning the danger signal?（）.
A:When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal
B:Only the stand-on vessel can sound the danger signal
C:Distress signals may be used in place of the danger signal
D:The danger signal consists of 4 or more short blasts of the whistle

出自：海船船员证

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