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【简答题】
. 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
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【简答题】● 为增强访问网页的安全性,可以采用___(15)___协议;为证明数据发送者的身份与数据的真实性需使用___(16)___。 (15)A.Telnet B.POP3 C.HTTPS D.DNS (16)A.散列算法 B.时间戳 C.数字信封 D.加密算法
【简答题】化合物 CH 3 COCH 3 有 种化学不等价氢。 A . 1 B. 2 C. 3 D. 4
【单选题】为增强访问网页的安全性,可以采用(14)协议;为证明数据发送者的身份与数据的真实性需使用(15)。
A.
Telnet
B.
POP3
C.
HTTPS
D.
DNS
【单选题】某一含氧化合物的红外吸收光谱中,在3300~2500cm -1 处有一个宽、强的吸收峰,下列物质中最可能的是哪一种?
A.
CH 3 CH 2 CH 2 OH
B.
CH 3 CH 2 COOH
C.
CH 3 CH 2 CHO
D.
CH 3 COCH 3
【单选题】为增强访问网页的安全性,可以采用(15)协议;为证明数据发送者的身份与数据的真实性需使用(16)。
A.
TeInet
B.
POP3
C.
HTTPS
D.
DNS
【判断题】化合物 CH 3 CH 2 OCH 2 CH 3 和 (CH 3 ) 3 COCH 3 都有两种不等性质子.
A.
正确
B.
错误
【多选题】一种含氧化合物,在红外光谱的3500~3000cm-1区域和1600~1650cm-1处有特征吸收,可能是下列哪些物质?
A.
CH 3 CHO
B.
CH 2 = C(OH)CH 3
C.
CH 3 COCH 3
D.
Ar-OH
【单选题】化合物(CH3)2CHCH2COCH3中化学不等价的质子有( )种
A.
4
B.
5
C.
6
D.
7
【单选题】一种含氧化合物,在红外光谱的 3500~3200 cm -1 区域有吸收,该化合物可能是
A.
CH 3 CHO
B.
CH 3 COCH 3
C.
CH 3 CH ( OH ) CH 3
D.
CH 3 -O-CH 2 CH 3
【单选题】为增强访问网页的安全性,可以采用(15)协议;为证明数据发送者的身份与数据的真实性需使用(16)。
A.
Telnet
B.
POP3
C.
HTTPS
D.
DNS
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