系统调查的方法有那些?

题型:问答题 简答题

问题:

系统调查的方法有那些?

考点:高级信息系统项目管理师信息系统项目管理师综合练习信息系统项目管理师综合练习题库
题型:问答题 简答题
已知a是正整数,方程组
ax+4y=8
3x+2y=6
的解满足x>0,y<0,则a的值是多少?
题型:问答题 简答题

()不能用于办理支付结算需要交验的个人有效身份证件。

A.士兵证

B.驾驶证

C.护照

D.户口簿

题型:问答题 简答题

Millions of young people are writing blogs. Millions of others are reading them. The word "blog" is a short way of saying Web log.

Many popular Web sites now offer free, easy ways to create personal Web pages and fill them with writings and pictures. Web sites called "Facebook" and "MySpace" are some of the most popular blog sites for young people. Many young adults use their blogs to write about daily activities and events in their lives. They also provide a place for people to write their ideas and opinions and how they think of others’ ideas.

Blogs offer young people a place to show their writings and feelings. They can also be helpful to connect young people with others. But blogs can become dangerous when they are read on the Internet by millions of people all over the world.

Recent studies show that young people often provide their names, age and where they live on the Internet. That may not be safe for them. This personal information puts them at risk of being searched out by dangerous people who want to hurt them. Many students do not know about privacy and are surprised to learn that adults can read their personal daily records easily. Students can also get into trouble when they put information about others on their blogs. 

As a result, many schools have banned the use of blogging web sites on school computers. Many schools have also begun teaching parents about the web sites. Parents should know what their children are doing online and should read their blogs to make sure they are not giving out private information. One way to keep away from these problems is to use programs so that blogs can be read by "friends only." people can read the website only if they know a secret word chosen by the blogger.

60. "Facebook" and "MySpace" are ________.

A. school subjects                               B. computer programs

C. school online BBS                          D. blog sites for young people     

61. Blogs may be dangerous because________.

A. they get in the way of studies         B. they are not allowed for school students

C. surfing the Internet is bad for eyes D. personal information can be found in blogs easily

62. This passage is mainly about _________.

A. the safety of children’s blogs         B. how to search the internet

C. students’ behavior at school             D. communicating with parents at home

63. According to the passage, many schools help children avoid blog problems by doing

everything EXCEPT________.

A. teaching parents about the web sites

B. asking students to use programs to refuse strangers

C. telling school students not to make any net friends

D. stopping students from blogging on school computers   

64. You can enjoy your blog safely if________.

A. you write your blog at school

B. use a secret number for friends to enter your blog

C. your parents have little knowledge about websites

D. you show all your writings and feelings in your blog

题型:问答题 简答题
如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

题型:问答题 简答题

关于CT数据采样过程中的注意点,错误的是

A.X线球管和探测器是一个精准的准直系统
B.球管和探测器围绕受检者旋转是为了采样
C.X线球管产生的射线是未经过任何过滤的原始射线
D.射线束的宽度是根据层厚大小设置并严格准直的
E.探测器接收的是透过人体后的衰减射线

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