单选

● ITU 制定的视频会议系列标准中, (60) 系列标准是为了在公共电话交换网络(PSTN)上实现可视电话业务而制定的。

(60)

  • A. H.320    
  • B. H.323   
  • C. H.324   
  • D. H.264
参考答案
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