500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/28/1114188997.gif');}" onmousewheel="return imgzoom(this);">我的AT电源怎么了
本该12V变成了8V,本该5V变成了3.8V.请高手给讲解一下494及其周围电路工作原理.494-12脚10V为什么?
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