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单选题
食物过敏反应的机制是（）
A
抗体与食物结合
B
抗原与食物结合
C
免疫球蛋白和食物中的抗原结合
D
免疫球蛋白和抗体结合
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单选题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？（）A
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Run the dnscmd command by using the /zonerefresh option on DC1.C
Run the dnscmd command by using the /zonerefresh option on SRV1.D
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