预警
分级
划分出危险的程度,问题的棘手程度。
- 红色警报
- 橙色警报
- 黄色警报
参考
- Wragg, David W. first. Osprey. 1973: 115. ISBN 9780850451634.
- Waidyanatha, Nuwan. . International Journal of Critical Infrastructures. No 1. 2010, 6: 31–51 [3 August 2012]. doi:10.1504/ijcis.2010.029575. (原始内容存档于2019-06-18).
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