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You are in charge of a stand-on vessel in a crossing situation.The other vessel is 1.5 miles to port.You believe that risk of collision exists.You should（）.
A:take avoiding action immediately upon determining that risk of collision exists
B:immediately sound the danger signal
C:take avoiding action only after providing the give-way vessel time to take action ,and determining that her action is not appropriate
D:hold course and speed until the point of extremis, and then sound the danger signal, taking whatever action will best avert collision

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出自：海船船员证

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