The following events all require an SDCCH. Which event has normally the longest holding time? （） A:Normal updating B:IQMSI attach/detach C:Registration D:Call set-up E:SMS point-to-point

The following events all require an SDCCH. Which event has normally the longest holding time? （）
A:Normal updating
B:IQMSI attach/detach
C:Registration
D:Call set-up
E:SMS point-to-point

出自：中国移动网络维护生产岗位

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