string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%97%E5%8E%8B%E5%BC%BA%E5%BA%A6%E7%9A%84%E8%AE%A1%E7%AE%97%E6%96%B9%E6%B3%95%E5%92%8C%E6%AD%A5%E9%AA%A4 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
抗压强度的计算方法和步骤
