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  3. What does the passage mainly discuss? What color filter would absorb red wavelengths?

What does the passage mainly discuss? What color filter would absorb red wavelengths?

admin2009-06-15  69
问题 What does the passage mainly discuss?
What color filter would absorb red wavelengths?
选项 A、Red.
B、Cyan.
C、Magenta.
D、Yellow
答案B
解析 从第三段第二句可知：减去法的基础色为cyan(深蓝)，magenta(洋红)和yellow(黄)；这三种染色分别吸收红(red)，绿(green)，蓝(blue)。
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