You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.<br>A:Your speed must be reduced to bare steerageway<br>B:A look-out is not required if the radar is on<br>C:Fog signals are only required when a vessel is detected by radar<br>D:The radar should always be kept on a short-range scale

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 steerageway
B:A look-out is not required if the radar is on
C:Fog signals are only required when a vessel is detected by radar
D:The radar should always be kept on a short-range scale

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