题目内容
假设某磁盘的每个磁道划分成11个物理块，每块存放1个逻辑记录。逻辑记录R0，R1，...，R9，R10存放在同一个磁道上，记录的存放顺序如下表所示：物理块1234567891011逻辑记录R0R1R2R3R4R5R6R7R8R9R10 如果磁盘的旋转周期为33ms，磁头当前处在R0的开始处。若系统使用单缓冲区顺序处理这些记录，每个记录处理时间为3ms，则处理这11个记录的最长时间为______；若对信息存储进行优化分布后，处理11个记录的最少时间为______。 ______标准的目标是制定一个开放的多媒体应用框架标准。
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In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. With the implementation of 5 , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of 6 interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be 7 . For example, one computer may be a small single - user computer, while another may be a large 8 system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, 9 , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. With the implementation of 5 , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of 6 interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be 7 . For example, one computer may be a small single - user computer, while another may be a large 8 system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, 9 , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.
某服务器软件系统对可用性(Availabilty)和性能(Performance)要求较高，以下 15 设计策略能提高该系统的可用性， 16 设计策略能够提高该系统的性能。
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