问题 单项选择题

作业设备的例行保养是指()进行的维护保养。

A、每班(8h工作)

B、每天

C、每次启动之前

D、每周

答案

参考答案:A

问答题

阅读下列说明,回答问题。

[说明]

某公司拟开发一多用户电子邮件客户端系统,部分功能的初步需求分析结果如下。

(1)邮件客户端系统支持多个用户,用户信息主要包括用户名和用户密码,且系统中的用户名不可重复。

(2)邮件账号信息包括邮件地址及其相应的密码,一个用户可以拥有多个邮件地址(如user1@123.com)。

(3)一个用户可拥有一个地址簿,地址簿信息包括联系人编号、姓名、电话、单位地址、邮件地址1、邮件地址2、邮件地址3等信息。地址簿中一个联系人只能属于一个用户,且联系人编号唯一标识一个联系人。

(4) 一个邮件账号可以含有多封邮件,一封邮件可以含有多个附件。邮件主要包括邮件号、发件人地址、收件人地址、邮件状态、邮件主题、邮件内容、发送时间、接收时间。其中,邮件号在整个系统内唯一标识一封邮件,邮件状态有已接收、待发送、已发送和已删除4种,分别表示邮件是属于收件箱、发件箱、已发送箱和废件箱。一封邮件可以发送给多个用户。附件信息主要包括附件号、附件文件名、附件大小。一个附件只属于一封邮件,附件号仅在一封邮件内唯一。

该邮件客户端系统的主要关系模式如下,请填补(a)~(c)的空缺部分。

用户(用户名,用户密码)

地址簿((a),联系人编号,姓名,电话,单位地址,邮件地址1,邮件地址2,邮件地址3)

邮件账户(邮件地址,邮件密码,用户名)

邮件((b),收件人地址,邮件状态,邮件主题,邮件内容,发送时间,接收时间)

附件((c),附件号,附件文件名,附件大小)

单项选择题

阅读下面短文,从短文后各题所给的四个选项(A、B、C 和 D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

                                    A Heroic Driver

Larry works with Transport Drivers. Inc. One morning in 2009. Larry was  41

along 165 north after delivering to one of his    42   . suddenly, he saw a car with its bright lights on.    43    he got closer, he found 44    vehicle upside down on the road. One more look and he noticed    45    shooting out from under the    46    vehicle. Larry pulled over, set the brake and    47   the fire extinguisher (灭火器). Two good bursts from the extinguisher and the fire was put out.

The man who had his bright lights on    48    and told Larry he had    49    an emergency call. They    50    heard a woman’s voice coming from the wrecked (毁坏的) vehicle.    51   the vehicle, they saw that a woman was trying to get out of the broken window. They told her to stay    52    until the emergency personnel arrived,    53    she thought the car was going to    54   . Larry told her that he had already put out the fire and she should not move    55    she injured her neck.

Once fire and emergency people arrive, Larry and the other man    56    and let them go to work. Then, Larry asked the    57    if he was needed or    58    to go. They let him and the other man go.

One thing is    59   —Larry went above and beyond the call of duty by getting so close to the burning vehicle! His    60    most likely saved the woman’s life.

54()

A.explode

B.slip away

C.fall apart

D.crash