单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）AYour speed must be reduced to bare steerage waysBA look-out is not required if the radar is onCThe radar should always be kept on a short-range scaleDFog signals are only required when a vessel is detected by radar
单选题
You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）
A
Your speed must be reduced to bare steerage ways
B
A look-out is not required if the radar is on
C
The radar should always be kept on a short-range scale
D
Fog signals are only required when a vessel is detected by radar
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