97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<ruby id="4qdup"><output id="4qdup"></output></ruby>

單項選擇題

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

你可能感興趣的試題

單項選擇題

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

單項選擇題

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

<ruby id="2uku5"><xmp id="2uku5"></xmp></ruby>

<pre id="2uku5"><acronym id="2uku5"></acronym></pre>

<blockquote id="2uku5"></blockquote>