string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%80%90%E5%8E%8B%E5%80%BC%E5%A6%82%E4%BD%95%E8%AE%A1%E7%AE%97 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
耐压值如何计算
