正在加载图片...
In both cases the result is the same- The contrast between the object and the background approaches zero when the light coming along the line of sight from the object approaches the intensity of the light from the background at the horizon When the eye can no longer distinguish the difference, the contrast, between the object and the background the object can not be seen, and it is said to be beyond the limit of visibilityIn both cases, the result is the same— The contrast between the object and the background approaches zero when the light coming along the line of sight from the object approaches the intensity of the light from the background at the horizon. When the eye can no longer distinguish the difference, the contrast, between the object and the background, the object can not be seen, and it is said to be beyond the limit of visibility
<<向上翻页向下翻页>>
©2008-现在 cucdc.com 高等教育资讯网 版权所有