下列关于磁场的说法中,正确的是( ) A.磁场只有在磁极与磁极磁极与电流发生相

题型:选择题

问题:

下列关于磁场的说法中,正确的是(   )

A.磁场只有在磁极与磁极磁极与电流发生相互作用时才产生

B.磁场是为了解释磁极间相互作用而人为设定的

C.磁极和磁极之间是直接发生相互作用的

D.磁场和电场一样,是客观存在的特殊物质

考点:磁现象磁场,地磁场
题型:选择题
动词填空,选择方框中的动词并用其适当的形式填入相应的句子中。
  take, play, get, be, help
1. Everyone in our class _____here.
2. Let me _____you.
3. Do you know what time they _____up?
4. Please _____these books to Room 209.
5. Tom, come here, _____games with us.
题型:选择题

样本选取的方法有()。

A.随机数表法

B.分层法

C.系统选取法

D.整群选样法

题型:选择题

D

As school fl,tats again,there’s SO much mole for an American parent to nag(唠叨)about,like

homework,bedtime and lost hours on the Intemet.But in the age of digital childhood,Jacky Long-well,45,of McLean,Virginia,often text—messages(发短信)what she OnCe told her children bymouth_"Be nice to your brother;walk the dog;remember your reading.

This is the world of the modem family,in which even reminding children to do something has

become electronic.

There  are changes in how parents nag and in what they nag about and in the frequency of their

nagging.

With technology,“you nag more,and you are a little bit more:precise with your nagging.’’said

Reginald  Black,46,of Woodbridge,Virginia.

For many young people,electronic nagging is part of the experience of growing up.Charles Flowers,17,131.$enior at St.John“College High School in Washington.says his mothel-reminds him about everything from laundry,being Oil time to baseball practice and mowing the lawn by text.

When she uses capitals he knows she is serious:GET HOME!

Some say technology has made nagging less annoying.

Jaeky Longwell thinks texts ale less emotional than spoken messages and less likely to be resisted by teenagers.

It’s not as painful for them to hear it by text.It becomes grouped with the friendly communication,”she said.“They can’t hear the nagging.”

She thinks a good way to do it is to mix friendliness with nagging.A parent Call always start by

saying hello.

Not all parents like the new electronic r,agging.Joyce Bouehard,51,a mother of four in Fairfax,Virginia,texts her 14一year—old son but says that for many  things — chores,homework— the

old—fashioned way works better.Nagging by text has risks,she notes:I always think,if you are texting them something and they are with their friends,they ale getting a big laugh out of it.’’

68.We can conclude from the first two paragraphs that————————.

A.American children often stay up late studying

B.Jacky Long'well had a happy aigital childhood

C.American parents pay too much attention to their children’s studies

D.American parents think a lot about their children’s characters

69.The example of Reginald Black is used to show readers————————.

A.that her nagging is thoughtful

B.how the amount and kind of nagging have changed with the arrival of the digital age

C.the kind of skills a parent needs to nag effectively

D.that she likes nagging her children very much

70.We can infer that—————————.

A.It’S better for parents to nag in a friendly,way

B.whether、nagging is e]ectronic or not,it is annoying

C.American parents generally don’t like to nag

D.American parents like to llse capital letters in messages

7 1.The main idea of the article is———————一.

A.the subjects American parents like to nag about

B.the reaSOliS American parents like to nag their children

C.that electronic nagging is becoming commoll in the U.S

D.how American parents began to nag their children by text messages

题型:选择题

Internet中的用户远程登录是指用户使用______命令,使自己的计算机暂时成为远程计算机的一个仿真终端的过程。

题型:选择题

证券公司向客户收取融资融券的利息费用时,按()时间标准计算。

A.按“天”计息

B.按“月”计息

C.按“年”计息

D.按“季”计息

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