单项选择题

A.hold your course and speedB.sound the danger signalC.……

Your vessel is crossing a narrow channel.A vessel to port is within the channel and crossing your course.She is showing a black cylinder.What is your responsibility?（）

A.hold your course and speed
B.sound the danger signal
C.begin an exchange of passing signals
D.do not cross the channel if you might impede the other vessel

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A.displacement
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C.discharging
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C.is changing cyclonically or variably in direction
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A.MOVE
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A.be initiative
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B.Immersion suits
C.Axes
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