单选题The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.Aunder existing visibility conditionsBunder perfect visibilityCwith ten miles visibilityDwith fifteen miles visibility
单选题
The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.
A
under existing visibility conditions
B
under perfect visibility
C
with ten miles visibility
D
with fifteen miles visibility
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