问题 单项选择题

为确保数据能完整地从终端微机传送到主机,且不存在任何外加的数据,下面哪一项计算机控制程序将最有效

A.采用校验位技术,以确保只有经批准的零部件代码能添加到数据库中。
B.采用批控制总数校验,包括控制每批的数量与金额总数和杂项总数。
C.设置密码,确保只有经批准的人才能将数据发送到主机。
D.设置字段编辑控制,由计算机自动检查每个字段的字母/数字的完整性。

答案

参考答案:B

解析: A.不正确,采用校验位技术能够检查数据的正确性,但对于数据丢失等情况就无能为力了。
B.正确。批控制总数校验可以检查出绝大部分数据错误,如数据错位、丢失、重发等。杂项总数校验则可以进一步提高错误检测率,对一些批总数控制无法发现的错误(如多项金额同时发生错误,但总数不变的情况),杂项总数控制也能发现。
C.不正确,设置密码只能保证输入数据的人是经授权的,但不能防止该人员输入数据发生错误。
D.不正确,字段编辑控制只能控制输入的是合理的字段,无法控制输入数据的数量和准确性、完整性。

计算题
阅读理解

The Future Stars

General introduction

The Future Stars was set up in 1988 as a non-profit service center for child development devoted to providing quality childcare in a loving and educational environment for children 6 weeks to 6 years of age. Our funds mainly come from public donations.

A healthy curiosity about learning is the most important quality for early childhood development. We aim at offering high quality developmentally age-appropriate activities for early childhood, the most Important time of child development, so that they can do better after they start formal schooling.

Hours of operation

Childcare will be provided for the child from 7:00 am to 6:00 pm Monday through Friday except for holidays. Children may not arrive before 7:00 am or remain after 6:00 pm. Should an emergency arise, the parent should immediately make us know in consideration of our work arrangements. A late charge of $ 1.00 per minute will be assessed if the child is not picked up by 6:05 pm. Charges for these services are to be paid directly to the staff person that has been looking after your child until your arrival, not to the center. Failure to pay late charges may affect continued services with the center.

Tuition (学费)

When it has been confirmed that a position is available for your child, you must pay a registration (注册) fee of $200 per child.

The weekly tuition fee is $ 98.00. You can make payments either by credit card or in cash on Monday every week. If your payment is not made by Tuesday at 9:00 am, you will be charged a $ 25.00 late fee.

For more information, please call 434-293-6110 or visit www.childdevelopmentcenter.com.

小题1:The Future Stars is intended for______.

A.would-be parents

B.teenagers

C.child experts

D.pre-school children小题2:What can we know about late pickups from the passage?

A.They may affect continued services with the center.

B.Parents have to pay late charges for them to the center.

C.Parents have to inform the center of them right away.

D.They greatly disturb the work arrangements of the center.小题3:If you want your child to receive childcare services from the Future Stars,you must ___.

A. pay extra for delayed payment

B. pay every Tuesday

C pay $ 98 for registration

D. pay in cash

小题4:What is the purpose of the passage?

A.To attract public donations.

B.To promote early education.

C.To tell the benefits of childcare.

D.To introduce a child development center.