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
正确答案:E
答案解析:有
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中国移动网络维护生产岗位(2013版)
中国移动网络维护生产岗位(2013版)
The following events all require an SDCCH. Which event has normally the longest holding time? （）
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