自信是走向成功的第一步，缺乏自信是失败的原因（莎士比亚）；自信——成功的第一秘诀

系统的综合要求有下列4个方面：( )、系统性能要求、运行要求和将来可能捉出的要求。

A．系统功能要求

B．运行分析

C．开发计划

D．数据要求

产业政策的( )是指根据产业结构演进的规律，对产业之间不等增长的动态结构做出准确、及时、适度的超前导向，以预防不均衡产生。

A．协调性

B．时效性

C．导向性

D．组合性

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）是（）

A.defense

B.intrusion

C.inbreak

D.protection

医患关系的特点是（）

A.以医疗活动为中心，以维护健康为目的

B.是帮助性的人际关系

C.以患者为中心

D.以上均是

天然色素有哪些类型？