string(249) "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%BB%8F%E5%85%B8%E9%A2%98%E7%9B%AE%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 101.89.143.195 port 38205: Connection refused"
二建经典题目有哪些
