string(276) "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%E5%B8%82%E6%94%BF%E5%A4%A7%E9%A2%98%E7%9B%AE%E5%BF%85%E8%80%83%E7%9F%A5%E8%AF%86%E7%82%B9 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
二建市政大题目必考知识点
