1 Abis nibble=1 16kbit/s channel。针对EDGE业务，4个Abis nibble可支持的编码方式为（）。A、CS1-CS2 and MCS1-MCS2B、CS1-CS4 and MCS1-MCS5C、CS1-CS4 and MCS1-MCS6D、CS1-CS4 and MCS1-MCS8E、CS1-CS4 and MCS1-MCS9
1 Abis nibble=1 16kbit/s channel。针对EDGE业务，4个Abis nibble可支持的编码方式为（）。
- A、CS1-CS2 and MCS1-MCS2
- B、CS1-CS4 and MCS1-MCS5
- C、CS1-CS4 and MCS1-MCS6
- D、CS1-CS4 and MCS1-MCS8
- E、CS1-CS4 and MCS1-MCS9
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