单项选择题

A.stop your enginesB.sound two prolonged blasts of the ……

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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单项选择题You are approaching another vessel and are not sure whether danger of collision exists. You must assume（）.

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