题目内容
______ aims to study the nature of language and tries to establish a theory of language.
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方程y’’+2y’+y=0的通解为
Cells in the parvo system can distinguish between two colors at any relative brightness of the two. Cells in the color-blind magno system, on the other hand, are analogous to a black-and-white photograph in the way they function: they signal. information about the brightness of surfaces but not about their colors. For any pair of colors there is a particular brightness ratio at which two colors, for example red and green, will appear as the same shade of gray in a black-and-white photograph, hence any border between them will vanish. Similarly at some relative red-to-green brightness level, the red and green will appear identical to the magno system. The red and green are then called equiluminant. A border between two equiluminant colors has color contrast but no luminance contrast The author mentions a "black-and-white photograph" most probably in order to explain
(2015年真题)简述组织、领导、参加恐怖组织罪的构成要件。
有关病理学检查资料的借用规定，下列丕正确的是
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