The following events all require an SDCCH. Which event has normally the longest holding time? （）A、Normal updatingB、IQMSI attach/detachC、RegistrationD、Call set-upE、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
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