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【单选题】
在光学总线系统中,一般将 _____________ 作为光波传输系统衰减常数的极限值,超出极限值即认为光波传输系统的信号衰减幅度过大,必须予以维修或更换。A.
1dB
B.
2dB
C.
3dB
D.
4dB
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举一反三
【单选题】线路传输速率为9600bit/s,供8个用户使用,在统计时分复用方式下,每个用户的最高速率可以达到()。
A.
l200bit/s
B.
2400bit/s
C.
4800bit/s
D.
9600bit/s
【单选题】These are specialized graphics programs for editing or modifying digital photographs.
A.
Image editors
B.
Desktop publishing
C.
Presentation graphics
D.
Illustrations
【单选题】Try to get to know the function of each part. The film is __
A.
in the back of the camera to hold the film. The film will sense the light and produce chemical reaction to develop the image.
B.
is the reflective device for the digital single lens camera. It is used to correct the reverse pictures on the focusing screen, so that operator can frame and focus correctly.
C.
the hole in the back of the camera that a photographer looks through to aim the camera.
【简答题】Addison Heard uses an image of his wife and infant son for the background on his laptop. An MBA student at the University of Virginia's Darden School of Business, Heard thinks about his family constan...
【单选题】Try to get to know the function of each part. The lens is ___
A.
is equivalent to an ideal film plane. Distance from the mirror to the focusing screen is equal to the distance from the mirror to the film plane.
B.
the reflective device for the digital single lens camera. It is used to correct the reverse pictures on the focusing screen, so that operator can frame and focus correctly.
C.
in the front of a camera to allow in light and to focus the image onto a viewing suce.
【单选题】Canesta Company has developed a virtual keyboard out of light to be used with cell phones and personal digital assistants (PDAs). The product beams an image of a keyboard on a desk, allowing the user ...
A.
a. factors of production
B.
b. customer characteristics
C.
c. product factors
D.
d. market factors
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