單項(xiàng)選擇題MOTO參數(shù)中已知:max_number_of_sdcch=24、number_sdcch_preferred=16sdcch_need_high_water_mark=4、sdcch_need_low_water_mark=16,當(dāng)sdcch被占用幾個(gè)時(shí),TCH會向sdcch轉(zhuǎn)換()

A.24
B.21
C.12
D.13


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