string(279) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2.5%E5%B9%B3%E6%96%B9%E5%8D%95%E8%8A%AF%E9%93%9C%E7%BA%BF%E8%83%BD%E5%B8%A6%E5%A4%9A%E5%B0%91%E5%8D%83%E7%93%A6 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
2.5平方单芯铜线能带多少千瓦
