现场临时用电系统没有按照“TN-S”系统进行设计和实施容易导致（）事故的发生。
A.触电
B.物体打击
C.高空坠落
D.坍塌
参考答案：A
读澳大利亚图1，回答1——2题。
小题1:12月22日前后①②③④地中太阳辐射最强的是（ ）
A．①
B．②
C．③
D．④小题2:①②③④四地中盛产苹果的是（ ）
D．④
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．
68（）
A．constructive
B．reductive
C．reactive
D．productive
