string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%A6%E5%AE%BD%E7%9A%84%E5%8D%95%E4%BD%8D%E6%98%AFhz%E5%90%97%E4%B8%BA%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
带宽的单位是hz吗为什么
