If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）<br>A:Rhythm<br>B:Period<br>C:Intensity<br>D:Color

If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）
A:Rhythm
B:Period
C:Intensity
D:Color

出自：海船船员证

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