单选题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?（）ARhythmBPeriodCIntensityDColor
单选题
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
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