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维生素B12又叫（），（）内含金属元素。

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完整的防雷装置包括接闪器、（）和接地装置。

A. 引下线
B. 避雷针
C. 避雷线

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经过加工处理并存储于记录介质上的间接信息称为（）

A. 原始信息
B. 再生信息
C. 零次信息
D. 一次信息

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What best describes the usage of Route-Target rewrite？（）

A. Route-Target Rewrite is mainly used in Inter-AS MPLS-VPN deployments and is configured at the PErouter in originating AS ASBR to avoid misconfiguration in Route-Target assignment for VPN configurations.
B. Route-Target Rewrite is mainly used in Inter-AS MPLS-VPN deployments and is configured at the route-Reflector in originating AS ASBR to avoid misconfiguration in Route-Target assignment for VPN configurations.
C. Route-Target Rewrite is mainly used in Inter-AS MPLS-VPN deployments and is configured at the ASBR to avoid misconfiguration in Route-Target assignment for VPN configurations.
D. None of the above.

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为了防止静电感应及雷电等发生电火花，架空乙炔管道每隔一定距离设置接地装置，接地电阻不应大于（）Ω。

A. 20
B. 80
C. 100
D. 60

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