以下不是主板上扩展插槽的是()。A.AGP B.EISA C.VGA D.PC

题型:单项选择题

问题:

以下不是主板上扩展插槽的是()。

A.AGP

B.EISA

C.VGA

D.PCI

考点:计算机维修工计算机维修工题库
题型:单项选择题

阅读理解。

      When you are curious about something and want to know more about it, you can use the way of asking

questions. Asking questions is the first step to make discoveries and find interesting answers. The following

steps can guide you during the research.

      Step l  Write down the subject that you are interested in on a piece of paper. Just get the main idea down.

For example, you might write: Discover more about robots.

      Step 2  Stop and think for a moment about what you have already known about your subject.

       List what you have already known like the sentences below:

      1. The first robot appeared in the USA in 1959.

      2. A robot can do housework and act as a teacher.

      3. Sometimes a robot catches viruses and causes a lot of problems.

      Step 3 What can you do with what you want to learn?

       By asking questions, start writing down questions about the robots on the paper:

       1. What might robots be like in the future?

       2. What other things can robots do for people?

       3. What kind of power will robots possibly use in five years?

      Step 4 Armed with your list of questions, you can now go to the nearest library or computer to begin

your research. As you learn more about your subject, you'll probably discover some new questions.

      For example, you might discover that robots can help scientists explore dangerous places, like the sea

and outer space. How? What happened? Asking new questions can help you research your subject more

widely.  

      The next time you find something interesting to research, take time to organize your thinking by asking

good questions. And remember that learning more always brings more questions.

1. What does the writer advise us to do when we're curious about something? 

A. To read more books about it.

B. To look it up in the dictionary.

C. To turn to the teacher for help,

D. To raise questions and find the answers.

2. What does the underlined part "Armed with your List of questions" mean?

A. Writing down your list of questions.

B. Discussing your questions with others.

C. Taking your list of questions with you.

D. Putting your list of questions under your arm.

3. What might be the correct order of the steps when you do research?

   ① List what you want to learn.

   ② Find new problems.

   ③ List what you've already known.

   ④ Choose a research subject.

A. ④③①②

B. ④①③②

C. ②③④①

D. ③②①④

4. What might be the best title for this passage?

A. Doing Research on Robots

B. Asking Good Questions While Doing Research

C. Having Interesting Answers on Robots

D. Finding Subjects before Doing Research

题型:单项选择题

转8A型转向架侧架的两个三角形孔的主要作用是()。

A.减轻侧架重量

B.便于列检人员检查闸瓦使用状态

C.便于铸造

D.便于列检人员检查并更换闸瓦

题型:单项选择题

具有解锁功能的安全认证工具有()

A.短信密码

B.二代数字证书

C.动态令牌

D.魔卡证书

E.可视卡

题型:单项选择题

×年×月×日上午10时15分,××煤气发电厂厂长指令锅炉房带班班长对锅炉进行点火,随即该班职工将点燃的火把从锅炉南侧的点火口送入炉膛时发生爆炸事故。
尚未正式移交使用的煤气发电锅炉在点火时发生炉膛煤气爆炸,炉墙被摧毁,炉膛内水冷壁管严重变形,最大变形量为1.5m。钢架不同程度变形,其中中间两根立柱最大变形量为230mm,部分管道、平台、扶梯遭到破坏,锅炉房操作间门窗严重变形、损坏。锅炉烟道、引风机被彻底摧毁,烟囱发生粉碎性炸毁,砖飞落到直径约80m范围内,砸在屋顶的较大体积烟囱砖块造成锅炉房顶11处孔洞,汽轮发电机房顶13处孔洞,最大面积约15m2,锅炉房东墙距屋顶1.5m处有12m长的裂缝。炸飞的烟囱砖块将正在厂房外施工的人员2人砸死,另造成5人重伤,3人轻伤。爆炸冲击波还使距锅炉房500m范围内的门窗玻璃不同程度地被震坏。
事故发生后,当地有关部门非常重视,迅速赶赴事故现场组织抢救,对死伤人员进行了妥善处置。×市政府责成有关部门和人员对事故进行了调查。
此次爆炸事故是由于炉前2号燃烧器(北侧)手动蝶阀(煤气进气阀)处于开启状态 (应为关闭状态),致使点火前炉膛、烟道、烟囱内聚集大量煤气和空气的混合气,且混合比达到轰爆极限值,因而在点火瞬间发生爆炸。具体分析如下:
1.当班人员未按规定进行全面的认真检查,在点火时未按规程进行操作,使点火装置的北蝶阀在点火前处于开启状态,是导致此次爆炸事故的直接原因。
2.煤气发电厂管理混乱,规章制度不健全,厂领导没有执行有关的指挥程序,没有严格要求当班人员执行操作规程,未制止违规操作行为,责职不明,规章制度不健全也是造成此将爆炸事故的原因之一。
3.公司领导重生产、轻安全,重效益、轻管理。在安全生产方面失控,特别是在各厂的协调管理方面缺乏有效管理和相应规章制度,对各厂的安全生产工作不够重视,也是造成此次爆炸事故的原因之一。
4.预防事故发生的措施
(1) ××公司要认真贯彻落实国家有关锅炉压力容器的法律、法规,真正从思想上吸取教训,引以为戒,制定出有效的详细的安全措施,健全各项安全管理制度。
(2)进一步完善各级安全生产责任制,明确锅炉安全管理的有关事项和要求,把锅炉的安全管理工作落到实处。
(3)各有关部门要严格执行各项规章制度及操作规程,层层落实,责任到人,消除麻痹思想和侥幸心理,操作程序规范化,从组织指挥、安全措施、规章制度、操作规程上彻底堵塞漏洞,消除隐患,从而防止类似事故再次发生。
请根据以上情景,回答下列问题。1~3题为单选题,4~8题为多选题。请将正确答案代码填写到题干括号内。

锅炉在操作、维修过程中存在的危险危害因素有( )。

A.锅炉爆炸

B.高温灼烫

C.透水

D.机械伤害

E.触电

题型:单项选择题

起重机的舱门口、端梁门、栏杆门开关,用以保护上机人员安全,统称安全开关,其触头是()触头。

A.动合

B.动断

C.延时

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