string(269) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%B8%80%E5%BB%BA%E5%B8%82%E6%94%BF%E6%96%B0%E6%97%A7%E6%95%99%E6%9D%90%E5%AF%B9%E6%AF%94 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
2021年一建市政新旧教材对比
