在操作系统的进程管理中,若系统中有8个进程要使用互斥资源R,但最多只允许2个进程进入互斥段(临界区),则信号量S的变化范围是();若信号量S的当前值为4,则表示系统中有()个进程正在等待该资源。 在操作系统的进程管理中,若系统中有8个进程要使用互斥资源R,但最多只允许2个进程进入互斥段(临界区),若信号量S的当前值为4,则表示系统中有()个进程正在等待该资源。
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以下光盘产品中,可重复擦写次数最多的是()。单面双层的只读DVD盘片的存储容量大约有()。 以下光盘产品中,可重复擦写次数最多的是()。
A. CD-R
B. CD-RW
C. DVD+R
DVD-RAM
JPEG图像编码标准可以支持()格式,其有损编码的核心算法是(),无损编码的核心算法是()。我们在图像处理软件中将图像另存为JPEG格式时,通常可以选择图像的重构质量,这是通过()环节进行调节的。 我们在图像处理软件中将图像另存为JPEG格式时,通常可以选择图像的重构质量,这是通过()环节进行调节的。
A. 图像分块
B. 变换编码
C. 系数量化
D. 熵编码
The province of Alberta lies along three of the major North American flyways Used by birds _______between their winter and summer homes.
A. the migration
B. migrating
C. migrate
D. and migrate
At a basic level, cloud computing is simply a means of delivering IT resources as ().Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking,programming tools,even communication services and collaboration ()。Cloud computing began as large-scale Internet service providers such as Google,Amazon,and others built out their infrastructure. An architecture emerged: massively scaled, () distributed system resources,abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on ()“somewhere on the Intemet”and the application runs on both the "cloud servers”and the user’s browser.Both clouds and grids are built to scale horizontally very efficiently. Both are built to withstand failures of () elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point, cloud services can be continuous. What’s more, clouds expand the types ofresources available —— file storage, databases, and Web services —— and extend the applicability to Web and enterprise applications. An architecture emerged: massively scaled,()distributed system resources,abstracted as virtual IT services and managed as continuously configured, pooled resources.
A. horizontally
B. vertically
C. inclined
D. decreasingly