题目内容

磁浮轴承的特点是：无机械磨损、（）、运动无噪声、无润滑、无污染、温升低。

A. 理论上速度无限
B. 无温升
C. 简单
D. 纯机械装置

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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 branc 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?（）

A. Restart the DNS server service on DC1.
B. Run the dnscmd command by using the /zonerefresh option on DC1.
C. Run the dnscmd command by using the /zonerefresh option on SRV1.
D. Set the refresh interval to 10 minutes on the start of authority (SOA) record.

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