题目内容

共用题干题ICMP协议属于因特网中的（1）协议，ICMP协议数据单元封装在（2）中传送。空白（2）处应选择（）

A. 以太帧
B. TCP段
C. UDP数据报
D. IP数据报

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共用题干题ICMP协议属于因特网中的（1）协议，ICMP协议数据单元封装在（2）中传送。空白（1）处应选择（）

A. 数据链路层
B. 网络层
C. 传输层
D. 会话层

在Linux中，外部设备文件放在（1）中，设备文件sdc标识的设备类型为（2）。空白（1）处应选择（）

A. /var
B. /etc
C. /dev
D. /root

共用题干题A requirement is simply a statement of what the system must do or what characteristics it needs to have. Requirements written from the perspective of user and focus on user needs are called (1). Requirements written from the developer's perspective and describe how the system will be implemented are called (2). Requirements evolve from detailed statements of the business capabilities that a system should have to detailed statements of the technical way in wluch the capabilities will be implemented in the new system. Requirements can be either functional or nonfunctional in nature. For example, during the analysis phase of travel vehicles sales system, the system that must have the ability to search for available inventory is (3). The requirement that the system should be able to work on any Web browser belongs to (4). That customer personal information is protected in compliance with the Data Protection Act is a requirement of (5). 空白（4）处应选择（）

A. functional requirement
B. technical requirement
C. operational requirement
D. information requirement

以下音频编码方法，（）编码使用了心理声学模型，从而实现了高效率的数字音频压缩。

A. PCM
B. MPEG音频
C. ADPCM
D. LPC