Building that railway was very difficult and involved ___ ten tunnels.

Which statement about implementing the Cisco IPv6 provider Edge Router over MPLS is true？（） A: 6PE feature is supported over tunnels other than RSVP-TE tunnels B: Core MPLS routers are supporting IPv6 ONLY C: 6PE feature is not supported over tunnels other than RSVP-TE tunnels D: Core MPLS routers are supporting IPv4 only

原文:穿山而建的铁路隧道长达数英里。译文:Railroad tunnels wh...t through mountains.

Which tunnels can be shared by multiple coal seams? （ ） A: Rise and dip B: District cross-cut C: District station D: Haulage way of section

What is Professor Thring's invention A: A kind of machine which miners ride on. B: A machine to supply fresh air to tunnels. C: A digging machine operated at a distance. D: A form of metal protective clothing.

American people's idea of mastering Nature can be seen in the following activities （ ）。 A: The construction of dams that hold back the waters of large rivers. B: All of the other three choices are correct. C: They moved the American frontier westward. D: The construction of tunnels that go through mountains.

They found a labyrinth of tunnels [color=#ff3853]under[/color] the ground. A: prep. 在…下面 B: prep. 顺着；沿着；在…里 C: prep. 关于；对于；涉及 未知类型：{'label': 'source', 'content': '柯林斯词典', 'isMemberControl': 0, 'type': 181}

PWE3业务网络的基本传输构件包括: A: 接入链路(AC) B: 伪线(PW) C: 转发器(Forwarders) D: 隧道(Tunnels) E: 封装(Encapsulation) F: PW信令协议(Pseudo wire Signaling) G: 服务质量(QOS)