string(303) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%86%8C%E6%B6%88%E9%98%B2%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%95%99%E6%9D%90%E6%AF%8F%E5%B9%B4%E5%8F%98%E5%8C%96%E5%A4%A7%E5%90%97 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
注册消防工程师教材每年变化大吗
