This is the 9th day of my participation in the November Gwen Challenge. Check out the event details: The last Gwen Challenge 2021

🐻 Data structure

The critical path is in the network of event nodes ___ (UESTC 2015)

A. Shortest path from source to sink B. Path with the largest number of edges from source to sink C. D. The longest path from the source point to the sinkCopy the code

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Answer: D

🐲 AOE (Activity On Edge) – also known as Edge represents the Activity of the web. AOE net is a weighted directed acyclic graph, in which vertices represent events, arcs represent activities, and weights represent duration of activities.

  • Path length: the sum of the duration of all activities on a path.
  • Critical path: indicates the path with the longest path length. D is correct.
  • Source point (starting vertex) : there is only one point in AOE net whose entry degree is 0.
  • Convergence point (end vertex) : there is only one point in AOE network whose output degree is 0.

Figure:

🐼 Computer network

If an HTTP-500 error is displayed when a user accesses a Web site, the cause of the fault is ___ (Sun Yat-sen University 2015)

A. The default router is incorrectly configured. B. Users are not allowed to access the Web server. The requested page does not existCopy the code

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Answer: C

🐲 is shown in the table:

classification Break down
1 * * Message, the server receives the request and requires the requester to proceed with the operation
2 * * successful
3 * * Redirect, requiring further action to complete the request
4 * * Client error
5 * * Server error

🐨 Operating system

Of the following options, the interface provided by the operating system to the application program is ___ (Beihang University 2010)

A. system call B. interrupt C. library function D. primitiveCopy the code

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Answer: A,

🐲 Program interface, also known as application programming interface, consists of a group of system calls to obtain the underlying services of the operating system and use or access various software and hardware resources managed by the system.

🐻❄️ Computer composition principle

The reason why all information in a computer is still represented in binary so far is ___. (University of Science and Technology Beijing, 2014)

A. only this way B. only this way Fast C. Physical device performance limitation D. Information processing is easy to parseCopy the code

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Answer: C

🐲 computer is composed of electronic components, considering the economy, reliability, easy to implement, simple operation, saving devices and other factors, in the computer number are represented by binary rather than decimal representation.

Because binary counting only needs two numeric symbols 0 and 1, in the circuit can be used in two different states — low level and high level to represent, the implementation of its operation circuit is relatively simple, to make 10 stable states of the electronic devices respectively represent 10 decimal numeric symbols is very difficult.

The exercises come from @Wangdao Weibo

The analysis is written by myself, if there are any questions or mistakes, please comment.

I am Mancuoj, welcome to pay attention to me and my computer entrance examination column (≧∇ Blue)