正确答案: D

系统和设备

题目：EMC标准是为了保证()正常工作而制定的。

解析：答案：D

查看原题

举一反三的答案和解析：

[多选题]● The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The （71） of passing through each network is the same; it is one （72） count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required. A （73） through a network can have different costs (metrics). For example, if maximum （74） is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum （75） is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.（71）

number

connection

diagram

cost

process

hop

route

flow

flow

window

route

cost

packet

throughput

error

number

delay

stream

packet

cost

解析：D,B,C,B,A

[单选题]

B． 存放一个字节的单元信息 C． 存放一个数据的单元集合 D． 存放一个字的单元集合

存放一个字的单元集合

[单选题]单向链表中往往含有一个头结点，该结点不存储数据元素，一般令链表的头指针指向该结点，而该结点指针域的值为第一个元素结点的指针。以下关于单链表头结点的叙述中，错误的是( )。

加入头结点后，在链表中进行查找运算的时问复杂度为O(1)

解析：解析：链表查找最常规的做法是从链表的头结点开始，顺序查找结点。由于需要顺序查找，时问复杂度自然就是O(n)了。