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简答题GSM手机一共支持哪几类语音版本?
  • (1) GSM full rate speech version 1(FR);
    (2) GSM full rate speech version 2 (EFR);
    (3) GSM full rate speech version 3 (AMR的全速率);
    (4) GSM half rate speech version (HR);
    (5) GSM half rate speech version 3 (AMR的半速率)
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