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见到一个推挽式电源,,不明白工作原理.希望各位老师讲解一下.
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/18/1086625564.bmp');}" onmousewheel="return imgzoom(this);">
