题目内容

{TSE}题基于以下题干 互联网好比一个复杂多样的虚拟世界,每台互联网主机上的信息又构成一个微观虚拟世界。若在某主机上可以访问本主机的信息,则称该主机相通于自身;若主机x能通过互联网访问主机y的信息,则称x相通于y。已知代号分别为甲.乙.丙.丁的四台互联网主机有如下信息: (1)甲主机相通于任一不相通与丙的主机; (2)丁主机不相通于丙; (3)丙主机相通于任一相通于甲的主机。 {TS}若丙主机不相通于自身,则以下哪项一定为真?

A. 甲主机相通于乙,乙主机相通于丙。
B. 若丁主机相通于乙,则乙主机相通于甲。
C. 只有甲主机不相通于丙,丁主机才相通于乙。
D. 丙主机不相通于丁,但相通于乙。
E. 甲主机相通于丁,也相通于丙。

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