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UMG8900支持ATM承载的业务类型包括（）。
- A、rt-VBR（real-time Variable Bit Rate）
- B、ABR（Available bit rate）
- C、CBR（Constant Bit Rate）
- D、UBR（Unspecified Bit Rate）
- E、nrt-VBR（noreal-time Variable Bit Rate）
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