不懂就问
<P><img src="attachments/dvbbs/2006-3/20063231538279710.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/2006-3/20063231538279710.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><BR>大家好，上图是我在一个论坛上看到的帖子，我把它整理后自己画的，由于本人</P><P>对电子不是很懂，所以请教大家，上面的电路能不能正常工作呢？</P> 可以工作,效率呢?该电路基本上没有什么实用价值
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