单选题Geographic range is the maximum distance at which a light may be seen under（）.Aexisting visibility conditions，limited only by the curvature of the EarthBperfect visibility conditions，limited only by the curvature of the EarthCexisting visibility conditions，limited only by the intensity of the lightDperfect visibility conditions，limited only by interference from background lighting
单选题
Geographic range is the maximum distance at which a light may be seen under（）.
A
existing visibility conditions，limited only by the curvature of the Earth
B
perfect visibility conditions，limited only by the curvature of the Earth
C
existing visibility conditions，limited only by the intensity of the light
D
perfect visibility conditions，limited only by interference from background lighting
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