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问题 单项选择题

民事行为被人民法院或者仲裁机关确认为无效时，不影响其他部分的效力的，其他部分( )。

A．当然无效

B．仍然有效

C．另行签订协议后有效

D．修改补充后有效

答案

参考答案：B

解析：依我国《民法通则》第60条规定，民事行为部分无效，不影响其他部分的效力的，其他部分仍然有效。

单项选择题

The network layer provides services to the transport layer. It can be based on either___20___. In both cases, its main job is ___21___ packets from the source to the destination.

In network layer, subnets can easily become congested, ncreasing the delay and ___22___ for packets. Network designers attempt to avoid congestion by proper design. Techniques include___23___ policy, caching, flow control, and more.

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client, traffic shaping, resource___24___, and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiated services, and MPLS.

20（）

A. virtual circuits or datagrams

B. TCP or UDP

C. TCP or IP

D. IP or ARP
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问答题 简答题

简述还原反应类型。
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