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【单选题】
电话系统所采用的交换( )
A.
分组交换
B.
电路交换
C.
报文交换
D.
信元交换
E.
解析: 电路交换的实时性强,但利用率低,适用于公用电话网;报文交换时延较大, 不适用于交互式通信;信元交换技术是一种对带宽、服务质量要求较高的方式;分组交换的主要应用领域为快速查询和应答的场合。
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