单选题Which statement is TRUE concerning the danger signal?（）.AWhen any vessel fails to understand the intentions of an approaching vessel she must sound the danger signalBOnly the stand-on vessel can sound the danger signalCDistress signals may be used in place of the danger signalDThe danger signal consists of 4 or more short blasts of the whistle
单选题
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
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