单项选择题
Which unit is the BSC perform the LAPD signalling and Inband signalling(64kpbs).（）
A.GS
B.SRS
C.TRH
D.TRAU
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A.10
B.20
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单项选择题
The following events all require an SDCCH. Which event has normally the longest holding time? （）
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C. Registration
D. Call set-up
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What is the most common value of the hysteresis used when estimating margins for log-normal fading? （）
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