照度计是什么？有什么功能，原理是什么？

http://baike.baidu.com/view/1145398.htm

分人可见光谱的，未修正的是硅光电池接收的，还有正弦函数特性。
以下都验证过。
The next generation keyboard, future keyboard!
It challenged and subverted the global computer keyboard, keyboard music instruments 25 years ago，
The pioneer of the Chinese people (firstly) originally entered this area. who sent it into the modern house of the CEO of Microsoft?
To challenge AT&T of the United States by improving communication deficiencies
Improving communication deficiencies, Chinese people are to challenge AT&T of the United States.

测量光照强度的，有的可以累计计量，有232接口的就可以连电脑

看书