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%E6%A0%87%E5%87%86%E5%80%BC%E6%80%8E%E4%B9%88%E8%AE%A1%E7%AE%97%E7%9A%84 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
抗压强度标准值怎么计算的
