"2018计算机复试题及答案解析-操作系统、计算机网络、数据结构等核心知识梳理"

2018年的复试题包含了关于操作系统、计算机网络和数据结构的问题。这些概念分别是用来做什么的？此外，还涉及了Big O和small O的概念。Big O表示小于或等于的意思，而small O表示小于的意思。另外，还提到了PCB（进程控制块）和算法的概念。PCB是指进程存在的唯一标志，系统可以通过PCB了解进程的状态信息，以便控制和管理事务。而事务是指一个单元的工作，要么全做，要么全不做，保证一组数据的修改要么全部执行，要么全部不执行。此外，还介绍了事务的特点：ACID，即原子性（要么都做，要么都不做），一致性（运行中发生故障，必须回滚），隔离性（一个事务不能被其他事务干扰），持续性（事务一旦提交，对数据库的改变应该是永久性的）。另外，还涉及了原隔一尺（持）多态的概念，即接口的多种不同的实现方式，以及继承的概念，即一个类继承另一个类的功能，可以直接使用其属性和方法，并可以添加Java 单继承，c可以多继承（多个爹）。 Overall, the 2018 reexamination questions cover the concepts of operating systems, computer networks, and data structures. These concepts are used for different purposes. There is also a mention of the Big O and small O concepts, where Big O means less than or equal to and small O means less than. Moreover, the questions also touch on the concepts of PCB (Process Control Block) and algorithms. PCB is a data structure that uniquely identifies the existence of a process, and the system can use PCB to understand the status information of the process in order to control and manage transactions. Lastly, the questions introduce the characteristics of transactions, namely ACID – Atomicity (either all or nothing), Consistency (in the event of a failure, a rollback must occur), Isolation (one transaction cannot be interfered with by other transactions), and Durability (once a transaction is committed, the changes to the database should be permanent). Additionally, the questions also cover the concepts of original separation (holding) and polymorphism, which allow for multiple different implementations of interfaces, as well as inheritance, where one class inherits the functionality of another class, can use its properties and methods directly, and can add Java single inheritance, while C can have multiple inheritance (multiple fathers).