单选题Which statement is true concerning a vessel equipped with operational radar?（）.AThe Master of the vessel must be on the bridge when the radar is in useBThe radar equipment is only required to be used in restricted visibilityCThe use of a radar excuses a vessel from the need of a look-outDThis equipment must be used to obtain early warning of risk of collision
单选题
Which statement is true concerning a vessel equipped with operational radar?（）.
A
The Master of the vessel must be on the bridge when the radar is in use
B
The radar equipment is only required to be used in restricted visibility
C
The use of a radar excuses a vessel from the need of a look-out
D
This equipment must be used to obtain early warning of risk of collision
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