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问题 单项选择题

在研究任何一种故障的正序电流（电压）时，只需在正序网络中的故障点附加一个阻抗，设负序阻抗为Z2，零序阻抗为Z0，则两相短路接地故障附加阻抗为（）。

A、Z2+Z0

B、Z2

C、Z2*Z0/(Z2+Z0)

答案

参考答案：C

解析：题目来源：高压电网继电保护原理与技术第一章第二章
专业类型：继电保护
设备类型：公共部分
难度等级：一般
电压等级：其他
知识点：基础知识

单项选择题

Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, which operate at data link layer. They can accept (67) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two netwoks. If two networks have (68) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between the two transport connections. Finally, in the application layer, application gateways translate message
(69) . As an example, gateways between Internet e-mail and X.400 e-mail must (70) the e-mail message and change various header fields.

A．special

B．dependent

C．similar

D．dissimilar
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（）渴望成为群体中的优胜者与明星人物，有进取心，但不醉心于势力范围和主宰地位。

A.工匠型

B.企业人型

C.赛车手型

D.丛林斗士型
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