[求助] 关于胆前级！

小宏

以下是引用aeon在2004-11-13 22:13:00的发言：
<img src="attachments/dvbbs/2004-11/20041113221252134.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-11/20041113221252134.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

比较喜好a板的这图片，收藏了先。
有一点不明请dX们指点，这样加了负反馈之后增益该如何计算啊，这反馈量在多少怎样算
谢谢

大灰狼