问题
单项选择题
数据管理技术发展阶段中,人工管理阶段与文件系统阶段的主要区别是文件系统
A.数据共享性强
B.数据可长期保存
C.采用一定的数据结构
D.数据独立性好
答案
参考答案:B
解析: 人工管理阶段的特点是:数据不保存,数据无专门软件管理,数据不共享,数据不具有独立性。文件系统阶段特点是:数据可以长期保存,文件系统管理数据,数据独立性差,数据共享性差。
数据管理技术发展阶段中,人工管理阶段与文件系统阶段的主要区别是文件系统
A.数据共享性强
B.数据可长期保存
C.采用一定的数据结构
D.数据独立性好
参考答案:B
解析: 人工管理阶段的特点是:数据不保存,数据无专门软件管理,数据不共享,数据不具有独立性。文件系统阶段特点是:数据可以长期保存,文件系统管理数据,数据独立性差,数据共享性差。
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"It's my own fault." Carl Fenter pulled his jacket closer against the abnormal bite of cold morning wind. "The rest of the family is home, where it's__1__." Just another one of his__2__ideas-a big tamale (玉米粉蒸肉) feast after tonight's Christmas Eve service at the church-and look where it landed him:waiting in a line 50 people deep. Who would have guessed that the tamale in every shop in the city would be sold out the day before Christmas?But they__3__, as Carl knew.He had been driving all over El Paso that morning.__4__to bring home tamales, Carl tried one last shop, an old favorite out in Canutillo. When he arrived, a fresh batch (一炉) was__5__off the steamer in 45 minutes.__6__at the end of the snaking line of tamaleseekers, he watched the woman in front of him__7__her jacket to cover her shivering youngster.It wasn't long before she, too, __8__in the biting wind.After only a moment's__9__, Carl took off his own jacket and offered it to the__10__mother. Together, they__11__when the line slowly moved forward at last, and smiling people exited the shop carrying steamy bags.__12__, Carl got inside the door and__13__closer to the counter, the woman now first in line."Sorry folks, " the clerk announced, "that's the last of the tamales.""__14__!" Carl groaned (抱怨) with everyone else__15__behind him. "__16__, "stressed the man at the counter, "we'll have a final batch ready__17__, oh, about two hours." Defeated, Carl backed away, but the young mother grabbed his arm. "You're leaving?" "I__18__, "Carl glanced at his watch."I promised to put up luminarias (传统圣诞灯) at my church." "I'll get your order of tamales and bring them to your house." Carl's brow furrowed "I couldn't ask you to do that." "But it's__19__I can do.You lent me your coat." Her smile overrode (推翻) his objections."Just give me your address." She and her little girl settled in for the long wait. And at__20__noon on Christmas Eve, they delivered four dozen fragrant tamales-along with Carl's brown jacket-to his home. | ||||
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