string(252) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%BA%8C%E5%BB%BA%E6%95%99%E6%9D%90%E5%8F%98%E5%8A%A8%E5%A4%A7%E5%90%97 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
2021年二建教材变动大吗
