1:https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/dqhjbh/dqhjzlbz/201203/t20120302_224165.shtml
2:https://baike.baidu.com/item/%E5%A4%A7%E6%B0%94%E6%B1%A1%E6%9F%93%E6%B2%BB%E7%90%86/22031419
3:https://baike.baidu.com/item/%E5%A4%A7%E6%B0%94%E6%B1%A1%E6%9F%93/778495#3
4:间接参考