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关于无极灯,有工作原理图,请大家帮忙,图中的电容C4起什么作用?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/46/1160458889.gif');}" onmousewheel="return imgzoom(this);">
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