string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E9%80%A0%E6%95%99%E6%9D%90%E5%A4%9A%E5%B0%91%E9%92%B1%E4%B8%80%E4%B8%AA => Failed to connect to 14.18.117.71 port 38164: Connection refused"
一造教材多少钱一个
