string(277) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%95%E7%9B%B8%E7%94%B52.5%E5%B9%B3%E6%96%B9%E9%93%9C%E7%BA%BF%E8%83%BD%E5%B8%A6%E5%A4%9A%E5%B0%91%E7%93%A6 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
单相电2.5平方铜线能带多少瓦
