●计算机中常用的一种检错码是CRC，即 (4)&nbs

arisons were drawn
between the development of television in the 20th
century an
d the diffusion of printing in the 15th and 16th centuries.Yet much had happened between.As was discussed before，it was not until the 19th century that the newspaper became the dominant preelectronic mediam，following in the wake of the pamphlet and the bo
It is generally recognized，however，that the introduction of the computer in the early 20th century，followed by the invention of the integrated circuit during the 1960s，radically changed the process，although its impact on the media was not immediately appa
It was within the computer age that the term "information society" began to be widely used to describe the(72)within which we now live.The communications revolution has (73)both work and leisure and how we think and feel both about place and time，but ther

: ●有多种设备可以实现不同网段或网络之间的互连，互连设备通常可按工作在OSI模型中的层次来划分。在物理层实现互连的称为 (61) ；在数据链路层实现互连的称为 (62) ；在网络层实现互连的称为 (63) ；在运输层及以上高实现互连的设备称为网关或 (64) 。 (65) 也是一种用来构造局域网的常用设备，通常可以用双绞线把服务器与PC客户机等连入 (65) 。
(61) ~(63)

arisons were drawn
between the development of television in the 20th
century an
d the diffusion of printing in the 15th and 16th centuries.Yet much had happened between.As was discussed before，it was not until the 19th century that the newspaper became the dominant preelectronic mediam，following in the wake of the pamphlet and the bo
It is generally recognized，however，that the introduction of the computer in the early 20th century，(66) by the invention of the integrated circuit during the 1960s，radically changed the process，although its impact on the media was not immediately(67).As t
It was within the computer age that the term "information society" began to be widely used to describe thecontext within which we now live.The communications revolution has influenced both work and leisure and how we think and feel both about place and ti

AL制25帧／秒为例，已知一帧彩色静态图像(RG
B)的分辨率为256×256，每一种颜色用16bit表示，则该视频每秒钟的数据量为 (58) 。全电视信号主要由 (59) 组成。在视频信号实时处理技术中，如果电视扫描的正程时间为52.2ms，分辨率为512×512，实时意味着处理每个像素的时间近似为 (60) 。 (57) A．视频捕获卡
B．视频捕获卡、电影卡
C．视频捕获卡、电影卡、电视卡
D．视频捕获卡、电影卡、电视卡、视频转换卡 (58) A．256×256 ×3 ×16×25bps
B．512×512 ×3×8×25bps
C．256×256 ×3×8×25bps
D．512×512 ×3×16×25 bps (59) A．图像信号、同步信号、消隐信号
B．图像信号、亮度信号、色度信号
C．图像信号、复合同步信号、复合消隐信号

: ●用来辅助软件开发、运行、维护、管理、支持等过程中的活动的软件称为软件开发工具，通常也称为 (45) 工具。
使用软件开发工具有助于提高软件的开发、维护和管理的效率。集成型软件开发环境通常由工具集和环境集成机制组成。这种环境应具有 (46) 。环境集成机制有数据集成机制、控制集成机制和界面集成机制。
数据集成机制为环境中的工具提供统一的 (47) ；控制集成机制为 (48) 提供支持。界面集成机制使得环境中的所有工具具有 (49) 。
(45)