about GND -- from 云海飞雨

来源: MiHuPig 于 2012-06-14 10:01:02 [] [旧帖] [给我悄悄话] 阅读数 : (2502 bytes)

This is a reponse post from 云海飞雨. It has very good information about GND. Repost it here and hope other beginners like me could see it. Thanks a lot 云海飞雨 !

(Don't know what happened, I could not type in chinese this morning in my pc.)

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http://purewater.hep.com.cn/upload/filter/gnd.pdf

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