单选

在下面的说法中,(65)是正确的。

  • A.虚电路与线路交换没有实质不同
  • B.在通信的两个站点间只能建立一条虚电路
  • C.虚电路的各个节点不需要为每个分组作路径选择
  • D.虚电路在传送数据前必须建立起专用的通信线路
参考答案
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