NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

（69）处填（）。

A．defense

B．intrusion

C．inbreak

D．protection

根据起重机械安全管理措施的有关规定，电梯和载人升降机安全定期监督检验周期为( )。

A．半年

B．一年

C．两年

D．三年