根据程序局部性理论，Denning提出了工作集理论。工作集是进程运行时被频繁访问的页面集合。在进程运行时，如果它的工作页面都在(4)器内，能够使进程有效地运行，否则会出现频繁的页面调入/调出现象。

假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图1-2所示，那么在t1时刻的工作集是(5)。

(93)

(91)

(92)

Multipurpose Internet Mail Extension(MIME)is a(71)document messaging standard in the Internet enviroment, with MIME, users can send(72)Email messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be(73)into messages. It defines the fonts, formats, and(74)features of a document so the document can be easily(75)on many different types of systems.

(90)

(88)

(86)

(87)

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(66)is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(67)is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(68)functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(69)is the popular LAN developed under the direction of the IEEE 802.5.

(70)is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

(85)