string(339) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%9F%E4%BA%A7%E8%83%BD%E5%8A%9B%E6%8C%87%E6%95%B0%E6%B3%95%E4%B8%AD%E7%9A%84%E7%94%9F%E4%BA%A7%E8%83%BD%E5%8A%9B%E6%8C%87%E6%95%B0%E9%80%9A%E5%B8%B8%E4%B8%BA%E4%B8%80 => Failed to connect to 101.89.143.195 port 38205: Connection refused"
生产能力指数法中的生产能力指数通常为一
