一台计算机具有比较高的MTBF值,而MTTR的值很低,其含义是指( )。A.该计

题型:单项选择题

问题:

一台计算机具有比较高的MTBF值,而MTTR的值很低,其含义是指( )。

A.该计算机的可用性比较高

B.该计算机的可靠性比较高

C.该计算机便于维护

D.该计算机容错性好

考点:计算机等级考试信息管理技术计算机三级(信息管理技术)12
题型:单项选择题

阅读理解。

     Mobile phone has become a problem for middle schools. Some middle schools in Australia have

 banned students from carrying mobile phones during school hours.

     Mobile phone use among children has become a problem for the school this year. Several children have

  got mobile phones as Christmas gifts, and more students will want them.

     Mary Bluett, an official, said mobile phone use is a distraction to students during school hours and it

 also gives teachers so much trouble in their classrooms. Teachers were also saying that sometimes

 students might use phone messages to cheat during exams.

     She said some schools had tried to ban mobile phones. Some parents felt unhappy because they

 couldn't get in touch with their children.

     Many teachers said students should not have mobile phones at school, but if there was a good reason,

 they could leave their phones at school office. They also said there were many reasons why the students

 should not have mobile phones at school; they were easy to lose and were a distraction from studies.

     Many people say that they understand why parents would want their children to have phones, but they

  think schools should let the students know when they can use their mobile phones.

1. Some middle schools in Australia have banned students from carrying mobile phones _____.

    A. because they are students

    B. when they are free

    C. when they are at school

    D. because they are children

2. We know from the passage that some children get mobile phones from _____.

    A. the makers and sellers

    B. the passers-by and strangers

    C. their parents and friends

    D. some mobile phone users

3. What does the underlined word "cheat" mean in the passage?

    A. 聊天

    B. 核对

    C. 查询

    D. 作弊

4. Some parents felt unhappy because they couldn't _____ during school hours.

    A. use their mobile phones

    B. leave their mobile phones at school office

    C. help the teachers with their work

    D. get in touch with their children

题型:单项选择题

服务人员应根据客人所点酒水准备()的酒杯。

A、各种

B、相应

C、不同

D、多种

题型:单项选择题

一年的四季是地球围绕太阳进行()而形成的。

题型:单项选择题

如图所示,质量为m的小球,从桌面边缘A处以初速度V离开高为H的桌面,经B点到达地面C处.B点距地面高为h,不计空气阻力,下列判断正确的是(  )

A.若取A处为参考面,小球在B点具有的机械能是

mV2
2

B.若取B处为参考面,小球在A点具有的机械能是

mV2
2+mgh

C.若取地面为参考面,小球在C点的动能等于A处的机械能

D.小球从A运动到B、再从B运动到C,机械能的改变量一定相等

题型:单项选择题

On a routine visit to the physician, a client with chronic arterial occlusive disease reports stopping smoking after 34 years. To relieve symptoms of intermittent claudication, a condition associated with chronic arterial occlusive disease, the nurse should recommend which additional measure()

A. Taking daily walks.

B. Engaging in anaerobic exercise.

C. Reducing daily fat intake to less than 45% of total calories.

D. Avoiding foods that increase levels of high-density lipoproteins (HDLs).

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