单项选择题

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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单项选择题
The maximum distance at which a light may be seen under the existing visibility conditions is called（）.

A.nominal range
B.luminous range
C.charted range
D.geographic range
单项选择题
The luminous range of a light takes into account the（）.

A.glare from background lighting
B.existing visibility conditions
C.elevation of the light
D.observer's height of eye
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