题目内容

数据库应用系统通常会提供开发接口。若出于安全性考虑,对于只读数据,通常提供__(1)__以供外部程序访问;对于需要更新的数据,则以__(2)__的方式供外部调用,并由提供者完成对系统中多个表的数据更新。 空白(1)处应选择()

A. 基本表
B. 视图
C. 索引
D. 触发器

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共用题干题算术表达式采用逆波兰式表示时不用括号,可以利用__(1)__进行求值。与逆波兰式ab-cd+*对应的中缀表达式是__(2)__。 空白(1)处应选择()

A. 数组
B. 栈
C. 队列
D. 散列表

若数据A持有事务T1所加的排它锁,那么其他事务对数据A()。

A. 加共享锁成功,加排它锁失败
B. 加排它锁成功,加共享锁失败
C. 加共享锁、加排它锁都成功
D. 加共享锁、加排它锁都失败

CD音频的抽样频率最高可以达到44.1kHz,可以满足绝大多数音乐欣赏者的听觉需求,这是因为()。

A. 一般人的听觉范围最高可以达到44.1kHz
B. 计算机处理器的处理带宽只有44.1kbits/s
C. 一般人的听觉范围最高可以达到20kHz左右
D. 声卡的处理能力只能达到每秒抽样44.1k

Ravi,like many project__(1)__,had studied the waterfall model of software development as the primary software life-cycle__(2)__.He was all set to use it for an upcoming project,his first assignment.However,Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages,something that implied that the system had to be delivered and built in__(3)__and not as__(4)__. The situation in many other projects is not very different.The real world rarely presents a problem in which a standard process,or the process used in a previous project,is the best choice.To be the most suitable,an existing process must be__(5)__to the new problem.A development process,even after tailoring,generally cannot handle change requests.To accommodate change requests without losing control of the project,you must supplement the development process with a requirement change management process. 空白(4)处应选择()

A. parts
B. modules
C. software
D. awhole

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