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(183795 填空/问答)   The Integrated Services Digital Net…

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  The Integrated Services Digital Network(ISDN) is a set of international standards for access to advanced,all-digital public _(1)_network.

  ISDN standards have been defined by the _(1)_,a branch of the United Nations’ Internaational Telecommunications Union (ITU), in the series I and Q recommendations.

  There are five ISDN Standard Devices.A_(1)_ is any piece of communicating equipment that complies with the ISDN standard. _(1)_performs the logical interface functions of switching and local-device control. _(1)_performs the physical interface conversion between the dissimilar customer and network sides of the interface.

  ⑴A.information B.telecommunications C.global D.local

  ⑵A.ITU-T B.ITU-U C. ITU-A D. ITU-R

  ⑶⑷⑸A.TA B.TE C.NT1 D.NT2 E.ET

 答案:

A. B

B. A

C. B

D. C

E. D

 【附述】

  关键词 ARDS 相关信息:
属于ARDS初期表现的是  The Integrated Services Digital N…
  The Integrated Services Digital N…Our goods must be up to export standa…
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