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

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

出自：海船船员证

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