单选

●宽带ISDN的核心技术是 (42) 。
(42)

A．ATM技术 &n
bsp; B．光纤接入技术
C．多媒体技术
D．SDH技术

试题出自试卷《2011年网络管理员考试考前密卷（一）-上午试题》

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●宽带ISDN的核心技术是 (42) 。(42)

●宽带ISDN的核心技术是 (42) 。
(42)