單項(xiàng)選擇題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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1.單項(xiàng)選擇題In the safety communication,you can get your R/O()it for you.

A.do
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