下列关于数据库管理技术的发展的描述中，不正确的是( )。A．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

下列关于数据库管理技术的发展的描述中，不正确的是( )。

A．数据库管理技术大致经历了人工管理、文件系统、数据库系统和高级数据库系统 4个阶段

B．数据库管理技术的4个阶段程序和数据都是独立的

C．分布式数据库和面向对象数据库管理技术属于高级数据库技术

D．数据库系统阶段数据库中的数据可以被多个用户、多个应用程序共享

答案

参考答案：B

解析：人工管理阶段，计算机主要用于科学计算，硬件方面没有像磁盘这样可以直接存取、随机访问的外部存储设备。软件方面没有专门管理数据的软件，数据由计算或处理它的程序自行携带，两者混为一体，相互依赖，数据与程序都不具有独立性．

完形填空

Eighty-year-old retired tailor, James McKay, spent Saturday night in jail after __36__ thirty-year-old Keith Smith over the head __37__ his walking stick．McKay’s wife, Laurence told us that while McKay is usually a __38__ person, he had been __39__ to this act of violence by getting wet just once too often．
Smith lives above the McKays and it appears that not only is he a keen gardener, he is also a __40__ collector．Unfortunately for him, the water he sent over his balcony every day ended up on the McKay’s, or too often, on the McKays __41__．
“For the last fortnight, since Smith moved into the flat above us, we have hardly dared to go to our __42__,” said Laurene．She added that it wasn’t so much the water falling onto their balcony from Smith watering his plant __43__ bothered them, it was more the way he cleaned his fish tanks．“We’d be __44__ there happily reading our newspapers, when __45__ so much water would come from above that we’d be as wet as if we’d __46__ with our clothes on! Neither could we get rid of the __47__ of fish!”
And on Saturday evening it was just too __48__．“It was James’s birthday,” explained Laurene, “and I’d made him a birthday cake．The candles were a great sight as you can imagine, but James didn’t get to blow them out．” __49__, Smith emptied one of his larger tanks over his balcony and both the McKays and the cake were wet __50__．Rarely had Laurene seen McKay move so fast．“I couldn’t __51__ him．He was up there in a flash．It was the fastest I’d seen him move since 1964．”
Smith is not going to take things further with the police．He has also promised to change his__52__ from now on．And what of James McKay? __53__ he left the police station, a large crowd of supporters sang him, “Happy Birthday”．“__54__ the most exciting birthday __55__!” said the cheerful old man．“The best since my adolescence I’d say!”

D．unconsciously

D．Consequently

名词解释

就业弹性系数