string(265) "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%E9%A2%98%E5%BA%93%E4%B8%80%E5%85%B1%E6%9C%89%E5%A4%9A%E5%B0%91%E9%81%93%E9%A2%98 => Failed to connect to 218.78.59.96 port 38043: Connection refused"
二建题库一共有多少道题
