正确答案: A

LRU

题目：Most frequently used algorithm for page replacement is

解析：A

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学习资料的答案和解析：

[单选题]八进制1326变为十进制数的表达式为

1×83+3×82+5×81+7×80+2×8-1+6×8-2

[单选题]In developing a hospital database, it is determined that on the average, each patient will have 6 treatments during a hospital stay.The average length of a stay is three days.The hospital has 1000 beds.There are on the average 800 patients occupying beds each day.The relationship between PATIENT and TREATMENT is 1: M.The relationship between PATIENT and BED is 1:1, conditional.If treatment record occurrences are archived as soon as a patient is discarded from the hospital, how many occurrences of the TREATMENT records will be stored in the TREATMENT database file on the average?

1,600

[单选题]设有两个事务Tl和T2，它们的并发操作如下所示，则正确的结论是一——。Tl T2

丢失修改

解析：解析：向DB回写S后再次向DB回写s，属于“写后写”。丢失修改。

[单选题]用户可以对数据库中的数据进行查询、插入、删除和更新，体现了数据库管理系统的哪种功能?______。

数据操纵功能

[单选题]在大型企业的数据库应用系统中，联机事务处理(OLTP)和联机分析处理(OLAP)是常见的数据管理与数据分析形式。关于OLTP和OLAP，一般情况下，下列说法正确的是______。

OLTP要求系统必须具有很高的响应速度，而OLAP对系统响应速度的要求较为宽松

[单选题]蓝牙系统的跳频速率是( )。

1600次/s

[单选题]在“我的电脑”或“资源管理器”中使用鼠标同时选中多个不连续的文件时，需要按住()。

Shift