- A human and physical protection system (intrusion detection and delaying barrier) in accordance with the principle of in-depth defence (detection, delay, response), which is subjected to a system of inspection by the authorities;
- 按照深入防护原则（探测、阻挡、干预），建立实物和人员保护制度（具有探测防止侵入和阻挡作用的栅栏），由主管当局实行监督；