Which two features are unique to SPA 525 phones compared to SPA 501， SPA 502， and SPA 508 phones？ （）
- A、 monochrome backlit display
- B、 full-duplex speakerphone
- C、 MP3 music player
- D、 dynamic softkeys
- E、 Bluetooth
正确答案:C,E
答案解析:有
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