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我按照网上推荐的这个绝对值电路搭的,结果正弦波绝对化后负半周的波形根本不对,是怎么回事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/45/1159522461.gif');}" onmousewheel="return imgzoom(this);">
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