题目内容
（请给出正确答案）
A camera takes light rays bounced off objects and__________them on a sheet of a film．
A.concentrates
B.mixes
C.combines
D.focuses
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更多“A camera takes light rays boun…”相关的问题
Although photography (the Greek word for "writing with
light") and Filmmaking are now so much a part of our visual world
that we take them for granted, they are relative recent inventions. 【1】______
From the time of the Renaissance, many artists had used the
CAMERA OBSCURA draw forms and linear perspective accurately. 【2】______
A camera obscura was a dark room or box With light entering in a 【3】______
tiny hole, perhaps focused on by a lens. An inverted image from the 【4】______
world beyond would be thrown on the opposite wall or side, and its
outlines could be traced on paper. But it was until the first half of【5】______
the nineteenth century that several researchers working independent 【6】______
of each other found ways to capture this image permanently.
Late in the nineteenth century, sequences of still pictures began【7】______
to lead to “movies.” In the mid-twentieth century, the technology 【8】______
of capturing moving images from the world had evolved wireless 【9】______
television broadcasts. And now computer video graphics have opened
up vast new range of possibilities that may or may not originate in 【10】______
the world that we see.
【M1】
A.be less powerfull
B.travel much quickly
C.move less quickly
D.have to travel a greater distance
The vaults where his money was kept had huge, steel doors with【62】locks.【63】guards with pistols in their holsters were always on【64】in the bank. The tellers cages----the cubicles 【65】the bank clerks, or tellers, worked-actually.【66】 cages. They had gratings across the front, high sides and back, and a door that could be opened only by pushing a release button.
The new style. of bank design【67】some of these【68】features, but the idea now is to make the bank【69】 like a friendly place【70】than a forbidding fortress. The modem bank buildings are open and light,【71】large glass windows and doors. The tellers' cages have been【72】by flat, unobstructed counters. The【73】and burglar alarms are still there, but they are【74】noticeable than they【75】to be.
(61)
A．and
B．but
C．that
D．what
In the early 1800s the world【23】to change. There was little unknown land left in the world. People did not have to explore much any more. They began to work instead to make life belier.
In the second half of the 19th century many great inventions were made. Among them were the camera, the electric light and the radio. These all became a big part【24】our life today.
The first part of the 20th century saw more great inventions: the helicopter in 1909, movies with sound in 1926, the computer in 1928, and jet planes in 1930. This was also a time【25】a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.
The middle part of the 20th century brought new ways to help people【26】disease. They worked very well. They made people healthier and let them live【27】lives. By the 1960's most people could expect to live to be at least 60.
By this time most people had a very good life.' Of course new inventions continued to be made. Man began【28】ways to go into space. Russia made the first step. Then the United States took a step. Since then other countries, including China and Japan, have made their steps into space.
In 1969 man took his biggest step away from earth. Americans first walked on the moon. This is certainly just a【29】though. New inventions will someday allow us to do things we have never yet【30】.
(56)
A．discoveries
B．creations
C．invention
D．inventions
When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Schouten, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect, becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" super imposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation". Also, because of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightnesses or have similar colors, the adaptation will tend to become uniform. over the whole eye.
This selection is concerned primarily with ______.
A．the eye's adaptation to color
B．the properties of colored surfaces
C．the effect of changes in color intensity
D．experiments on colored objects
The Daguerreotype was______.
A. a Frenchman
B. a photographer
C. a kind of camera
D. a kind of picture
A.可以通过camera完成扫码识别
B.同一页面可以插入多个camera组件
C.onCameraFrame接口根据frame-size返回不同尺寸的原始帧数据，与Camera组件展示的图像不同，其实际像素值由系统决定
D.camera的调用需要使用wx.createCameraContext
