string(288) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%95%E7%9B%B82.5%E5%B9%B3%E6%96%B9%E9%93%9C%E7%BA%BF%E8%83%BD%E6%89%BF%E5%8F%97%E5%A4%9A%E5%A4%A7%E7%94%B5%E6%B5%81 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
单相2.5平方铜线能承受多大电流
