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整体吊弦之间的距离应符合要求，间距不得大于13米，允许误差为（）mm。

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48小时首回是指从（）开始计算回复时间，最晚在48小时内首次联系客户。

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在灭火时，将可燃物从燃烧物周围搬走，属于（）方法灭火。

A. 窒息法
B. 冷却法
C. 隔离法

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两台或两台以上的泵分别向同一条管路输送流体的方式叫泵的（）。

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Your company has two servers that run windows server 2008 named server2 and server3, both servers have the DNS server role installed. Server3 is configured to forward all DNS requests to server2. You update a DNS record on server2, you need to ensure that server3 is able to immediately resolve the updated DNS record. What should you do?（）

A. Run the dnscmd /clearcache on server3.
B. Run the ipconfig /flushdns command on server3.
C. Decrease the time-to-live (TTL) on the start of authority (SOA) record of na.contoso.com to 15minutes.
D. Increase the retry interval value on the start of authority (SOA) record of na.contoso.com to 15 minutes.

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