在真空中有一点电荷Q=2×10-5Ci产生的电场中,在距Q为r=10cmP处放一

题型:问答题

问题:

在真空中有一点电荷Q=2×10-5Ci产生的电场中,在距Q为r=10cmP处放一试探电荷q=5×10-8C,求:

①q受静电力的大小.

②P处的电场强度大小.

考点:库仑定律电场强度的定义式
题型:问答题

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The first MP4 player was born years ago. Soon many music fans were wondering how fantastic it is! If you have been into technology enough, perhaps you may have a knowledge of the MP4. If not, you do need to know something before buying one, even if you are familiar with MP3. MP3 is the CD-like disc with greater capacity. How about MP4? This small digital product will really enrich the joy from listening to music. You can even feel the “touch” of music to your soul!

Now, some similar digital products advertised as “MP4 players” are simply MP3 players, which do not play video and MPEG format (格式) and also lack other particular functions. These products confuse some buyers, as they may think the “MP4” players simply mean they can do more than MP3.

What is MP4?!

It is a multimedia container. It is not only used to store digital audio (音频) and digital video streams, especially those of MPEG, but can also be used to store other data such as subtitles (字幕) and pictures. As a most modern container format, it allows streaming over the Internet.

With the help of a piece of MP4 video equipment, you can change various programs such as MPEG to MP4, ASX to MP4, AVI to MP4 and so on, which can be done very quickly and easily without any effect on the sound quality. By installing (安装) DVD-MP4 software, you can transfer particular music from a DVD to an MP4 video file. It really excites your listening music experience. 

Then, there is MP4 advanced and you can set your own collection of all the programs — TV shows, games, and music. You can even see movies which are still running in cinemas. What else digital product could you possibly ask for? 

57. It is suggested here that you should ________ before buying an MP4 player

A. first be a music fan                                 B. have a knowledge of MP4

C. get familiar with MP3                                  D. buy a CD-like disc

58. From the passage, we can see that MP4 is ________ MP3. 

A. much bigger than              B. just as advanced as  

C. not so particular as              D. more functional than

59. Which function of MP4 is NOT directly mentioned in this passage?

A. Storing digital audio and video streams.    B. Recording some movies in cinemas.

C. Playing TV shows, games and movies.      D. Transferring particular music from a DVD.

60. From the last sentence, it’s clear that the writer tries to tell us it is _______.

A. reasonable to buy other digital products    B. impossible to buy something else

C. a very wise choice to buy an MP4       D. an exciting experience to buy an MP3  

题型:问答题

某市财政局2007年发生的部分经济业务如下: (1)收到国库报来“预算收入月报表”,当日预算收入l 000 000元。 (2)收到下级财政部门归还的借款200 000元。 (3)向市教委拨付教育经费250 000元。 (4)向自上级财政部门借入有偿使用的财政周转金500 000元。 (5)用预算结余资金购买国库券l20000元。 (6)收到属于上年度的预算收入80 000元。 (7)向市教委发放紧急借款200 000元,用于修理危险校舍。 (8)经批准,同意将上述借款200 000元转作拨款。 (9)根据“预算收入日报表”,当日养路费收入500 000元入账。 (10)收到上级财政拨来的专项补助650 000元。要求:为以上业务编制会计分录。

题型:问答题

某视力正常的同学,当他站在候车厅候车时,先是看到一辆汽车停在远处,然后朝他迎面驶来,图中能正确反映该同学在注视汽车行驶过程中,眼球晶状体曲度变化情况的是 [ ]

A.

B.

C.

D.

题型:问答题

宋太宗即位后改名为()。

题型:问答题

该进口设备的设备购置费为()万元。

A.1933.38

B.1981.71

C.1927.10

D.1928.70

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