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4000-7000

4000-7000

4000-7000

4000-7000

1

Our eyes can only feel the light waves (electromagnetic wave )with wavelengths ranging from 4000 to 7000A, which we call visible light .

人的眼睛只能感受波长范围在 4000-7000 埃的光（电磁）波 -我们称为可见光。

2

The Kazakhstan Institute of Management , Economics and Strategic Research , 4000-7000 USD a year.

哈萨克斯坦管理经济战略研究院，一年学费 4000-7000 美元

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