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问题:

[单选] 数据流图中的外部实体是指()

A . 与系统无关的单位和个人
B . 与系统有数据传递关系但不属于系统本身的人或单位
C . 系统的输入数据和输出数据
D . 上级部门或外单位

改变旅游消费态度的方法通常有哪几种? Your company has a main office and a branch office. The main office has a domain controller named DC1 that hosts a DNS primary zone. The branch office has a DNS server named SRV1 that hosts a DNS secondary zone. All client computers are configured to use their local server for DNS resolution. You change the IP address of an existing server named SRV2 in the main office.You need to ensure that SRV1 reflects the change immediately. What should you do?() Restart the DNS Server service on DC1.。 Run the dnscmd command by using the /zonerefresh option on DC1.。 Run the dnscmd command by using the /zonerefresh option on SRV1.。 Set the refresh interval to 10 minutes on the Start of Authority (SOA) record.。 You need to recommend changes to the network that address the user problems statement. What should you recommend?() Deploy DirectAccess.。 Configure folder redirection.。 Create a volume mount point.。 Implement additional DFS targets.。 数据流图的组成不包括() 输入。 外部实体。 处理。 数据存储。 下列哪几种理论属于危险分析与风险控制的系统分析理论:() FTA故障树分析理论。 SCL安全检查表技术。 FMFA故障及类型影响分析理论。 ETA事件树分析理论。 人机仿真理论。 数据流图中的外部实体是指()
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