单选题You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.Astop your enginesBsound two prolonged blasts of the whistleCsound the danger signalDslow to bare steerageway
单选题
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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