所附省内长途电信网与全国邮政网两个实例可供参考，它们也是本文理论的实际验证。
Two practical examples of provincial telecommunication network and postal network are also included for reference. And the theory proposed in this paper has been also checked by them.
所附省内长途电信网与全国邮政网两个实例可供参考，它们也是本文理论的实际验证。
Two practical examples of provincial telecommunication network and postal network are also included for reference. And the theory proposed in this paper has been also checked by them.
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