string(311) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B5%84%E6%9C%AC%E6%80%A7%E6%94%AF%E5%87%BA%E7%9A%84%E7%89%B9%E7%82%B9%E6%98%AF%E4%B8%80%E6%AC%A1%E6%8A%95%E5%85%A5%E4%BD%86%E5%A4%9A%E6%9C%9F%E6%94%B6%E7%9B%8A => Received HTTP code 403 from proxy after CONNECT"
资本性支出的特点是一次投入但多期收益
