string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E8%80%83%E8%AF%95%E5%BE%80%E5%B9%B4%E7%9C%9F%E9%A2%98%E9%9A%BE%E5%90%97 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
一建考试往年真题难吗
