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两种实用精密整流电路,请大虾帮忙分析下,分别分析下A,B两种原理,并说明2种有何区别,有何好处,谢谢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/56/1926791186104541.bmp');}" onmousewheel="return imgzoom(this);">
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