string(264) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E7%9C%8B%E4%B9%A6%E5%A5%BD%E8%BF%98%E6%98%AF%E7%9C%8B%E8%AE%B2%E4%B9%89%E5%A5%BD => Failed to connect to 14.18.46.51 port 38206: Connection refused"
二建看书好还是看讲义好
