string(253) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E9%80%9Fkb%E5%92%8Cmb%E7%AD%89%E5%8D%95%E4%BD%8D%E7%9A%84%E6%8D%A2%E7%AE%97 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
网速kb和mb等单位的换算
