string(254) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2010cad%E6%89%93%E4%B8%8D%E5%BC%80%E5%9B%BE%E7%BA%B8%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B => Failed to connect to 14.18.117.71 port 38069: Connection refused"
2010cad打不开图纸怎么回事
