單項(xiàng)選擇題You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
A.stop your engines
B.sound two prolonged blasts of the whistle
C.sound the danger signal
D.slow to bare steerageway
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A.there is a risk of collision
B.you are the give-way vessel
C.the other vessel is the give-way vessel
D.there is no risk of collision
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