单项选择题
A default Frame Relay WAN is classified as what type of physical network?()
A.point-to-point B.broadcast multi-access C.nonbroadcast multi-access D.nonbroadcast multipoint E.broadcast point-to-multipoint
单项选择题 Which network protocol does DNS use?()
单项选择题 DNS servers provide what service?()
填空题 钢筋混凝土地下连续墙施工与槽壁稳定有关的因素可以归纳为()、()和()三个方面。