string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E6%9C%BA%E7%94%B5%E5%BA%94%E8%AF%A5%E6%80%8E%E4%B9%88%E5%AD%A6 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
一建机电应该怎么学
