试题1

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试题2

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试题3

At a basic level, cloud computing is simply a means of delivering IT resources as （1）. Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration （2）. Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, （3）distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on （4）"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 towithstand failures of （5）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 servics can be continuous. What's more, clouds expand the types of resources available——file storage, databases, and Web services——and extend the applicability to Web and enterprise applications.
（1）A. hardware

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试题4

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试题5

若二叉树的先序遍历序列为ABDECF，中序遍历序列DBEAFC，则其后序遍历序列为（ ）。
A、DEBAFC
B、DEFBCA
C、DEBCFA
D、DEBFCA

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试题6

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试题7

下列安全协议中，与TLS最接近的协议是( )。
A．PGP

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试题9

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试题10

优先队列通常采用( 1 )数据结构实现，向优先队列中插入一个元素的时间复杂度为( 2 )
（1）A.堆

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