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问题 多项选择题

微机继电保护硬件构成通常包括（）部分。

A、数据采集系统；

B、数据处理单元，即微机主系统；

C、数字量输入／输出接口，即开关量输入和输出系统；

D、通讯接口。

答案

参考答案：A, B, C, D

选择题

She _____ when I came in.  [ ]

A. is drawing     

B. was drawing    

C. drew      

D. draws 

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单项选择题

Traditional IP packet forwarding analyzes the____(1)____IP address contained in the network layer header of each packet as the packet travels from its source to its final destination．A router analyzes the destination IP address independently at each hop in the network．Dynamic ____(2)____protocols or static configuration builds the database needed to analyze the destination IP address(the routing table)．The process of implementing traditional IP routing also is called hop—by—hop destination—based____(3)____routing．Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time，exist for this method of packet forwarding that diminish its____(4)____．New techniques are therefore required to address and expand the functionality of an IP—based network infrastructure．This first chapter concentrate on identifying these restrictions and presents a rew，architecture，known as multipIeprotocol____(5)____switching，that provides solutions to some of these restrictions．

(5)

A．const

B．cast

C．mark

D．label
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