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/20/1091414981.bmp');}" onmousewheel="return imgzoom(this);">
四个图的PCB覆铜厚度分别为:
a:18μm b:35μm C:70μm d:105μm
