数字电视(Digital TV)
第1题:
Directions: Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET I. ( 10 points)
Digital photography is still new enough that most of us have yet to form. an opinion about it, (1) develop a point of view. But this bash' t stopped many film and computer fans from agreeing (2) the early conventional wisdom about digital cameras—they' re neat (3) for you? But they're not suitable for everyday picture taking.
The fans are wrong: Moro than anything else, digital cameras are radically (4) what photography means and what it can be. The venerable medium of photography (5) we know it is beginning to seem out of (6) with the way we live. In our computer and camcorder (7) saving pictures as digital (8) and watching them on TV is no less practical—and in many ways more (9) than fumbling with rolls of film that must be sent off to be (10)
Paper is also terribly (11) . Pictures that are incorrectly framed, (12) ,or lighted are nonetheless committed to film and ultimately processed into prints.
The digital medium changes the (13) . Still images that are (14) digitally can immediately be shown on a computer (15) , a TV screen, or a small liquid - crystal display (LCD) built fight into the camera. And since the points of light that (16) an image are saved as a series of digital bits in electronic memory, (17) being permanently etched onto film, they can be erased, retouched, and transmitted (18) .
What's it like to (19) with one of these digital cameras? It's a little like a first date--exciting, confusing and fraught with (20) .
1. A) rather than
B) let alone
C) much less
D) so as to
第2题:
What would be the best title for the passage?
A.TV Will Rule the World
B.TV Will Disturb the World
C.TV Will Better the World
D.TV Will Remain in World
第3题:
R1501入口温度可用()来控制.
第4题:
()全称为Digital Video Broadcasting Handheld,它是欧洲的数字电视标准组织(DVB)为通过地面数字广播网络向便携/手持终端提供多媒体业务所制定的传输标准。
第5题:
数字电视和高清数字电视有什么区别?是否都是数字电视?
第6题:
DVD的英文全名是()。
第7题:
看数字电视需要购买数字电视机吗?
第8题:
DVB.S的含义是()。
第9题:
Birthday attacks are used against which of the following?()
第10题:
第11题:
第12题:
第13题:
is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74) is a device used to connect two separate network that use different communication protocol.
(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
A.MD
B.RSA
C.DES
D.MIB
第14题:
数字电视按照所呈现图像的清晰度从高到低可分为()数字电视、标准清晰度数字电视和低清晰度数字电视三类。
高清晰度
略
第15题:
DDN是()的缩写。
第16题:
我国数字电视按信号传输方式可分为()、卫星传输数字电视、有线传输数字电视。
第17题:
数字电视与数字电视机关系如何?
第18题:
看数字电视一定需要购买数字电视机。
第19题:
我国数字电视标准以欧标DVB为主,具体而言,卫星数字电视标准(),有线数字电视标准(),地面数字电视标准()。
第20题:
Which statement is true about the digital to analog conversion process?()
第21题:
第22题:
the two steps of digital to analog conversion are decompression and reconstruction of the analog signal
the two steps of digital to analog conversion are decoding and filtering
the two steps of digital to analog conversion are decompression and filtering of the analog signal
the two steps of digital to analog conversion are quantization and decoding
第23题: