string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E8%80%83%E8%AF%95%E6%95%99%E6%9D%90%E6%AF%8F%E5%B9%B4%E6%9B%B4%E6%96%B0%E5%90%97 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
二级建造师考试教材每年更新吗
