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一个交流RC并联电路，已知IR=6mA，IC=8mA，总电流I等于（）A。
A . 14
B . 10
C . 2
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0.35A等于350mA。
A . 正确
B . 错误
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电流1A＝（）mA＝106μA。
A . 10
；
B . 10
；
C . 10
；
D . 10
。
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1mA等于（）A。
A . 10
B . 10
C . 10
D . 10
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电荷在电场作用下有规则地定向运动，称为电流。电流的国际单位是安培，简称安，用字母A表示。常用的单位有毫安（mA）及微安（µA），换算关系是：1A=（）mA=（）µA。
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电流的单位：安培，简称安，用“A”，还有千安（KA）和毫安（mA）关系：1KA=1000A、1A=1000mA。（）
A . 正确
B . 错误
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有一台电流表共有四个挡：A：0～10mA，B：0～25mA，C：0～50mA，D：0～100mA用来校对温度变送器的输出（）档更精确适宜。
A . A、A
B . B、B
C . C、C
D . D、D
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1微安（μA）＝（）毫安（mA）
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When it comes to photography, I'm not an ____.
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It seems the job as a freelance reporter put less pressure on the second speaker than the job inadvertising.
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有A、B、C三个二极管，测得它们的反向电流分别是2mA、0.5mA、5mA；在外加相同的正向电压时，电流分别为10mA、 30mA、15mA。比较而言，哪个管子的性能最好？
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比率智商的计算公式是（)。A．MA/CA×l00B．CA/MAx100C．MA/CAD．CA/MA
比率智商的计算公式是()。
A．MA/CA×l00
B．CA/MAx100
C．MA/CA
D．CA/MA
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Photography can also be an art form. because artists can______.
A．take anything they like
B．keep a record of real life
C．take photos of the famous
D．show ideas and feeling in pictures
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Only a few of our features are written by our journalists: we get______of them from freelance writers.
A. none
B. some
C. most
D. all
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摄影（Photography)是一门影像技术、视觉艺术;1839年在法国公布于世，是18世纪重要的发明之一。（)
摄影(Photography)是一门影像技术、视觉艺术;1839年在法国公布于世，是18世纪重要的发明之一。()
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Photography was once an expensive, laborious ordeal reserved for life&39;s greatest milestones. Now, the only apparent cost to taking infinite photos of something as common as a meal is the space on your hard drive and your dining companion&39;s patience.
But is there another cost, a deeper cost, to documenting a life experience instead of simply enjoying it？ "You hear that you shouldn&39;t take all these photos and interrupt the experience, and it&39;s bad for you, and we&39;re not living in the present moment," says Kristin Diehl, associate professor of marketing at the University of Southern California Marshall School of Business.
Diehl and her fellow researchers wanted to find out if that was true, so they embarked on a series of nine experiments in the lab and in the field testing people&39;s enjoyment in the presence or absence of a camera. The results, published in the Journal of Personality and Social Psychology, surprised them. Taking photos actually makes people enjoy what they&39;re doing more, not less.
"What we find is you actually look at the world slightly differently, because you&39;re looking for things you want to capture, that you may want to hang onto," Diehl explains. "That gets people more engaged in the experience, and they tend to enjoy it more."
Take sightseeing. In one experiment, nearly 200 participants boarded a double-decker bus for a tour of Philadelphia. Both bus tours forbade the use of cell phones but one tour provided digital cameras and encouraged people to take photos. The people who took photos enjoyed the experience significantly more, and said they were more engaged, than those who didn&39;t.
Snapping a photo directs attention, which heightens the pleasure you get from whatever you&39;re looking at, Diehl says. It works for things as boring as archaeological(考古的)museums, where people were given eye-tracking glasses and instructed either to take photos or not. "People look longer at things they want to photograph," Diehl says. They report liking the exhibits more, too.
To the relief of Instagrammers(Instagram用户)everywhere, it can even makes meals more enjoyable. When people were encouraged to take at least three photos while they ate lunch, they were more immersed in their meals than those who weren&39;t told to take photos.
Was it the satisfying click of the camera？ The physical act of the snap？ No, they found; just the act of planning to take a photo—and not actually taking it—had the same joy-boosting effect. "If you want to take mental photos, that works the same way," Diehl says. "Thinking about what you would want to photograph also gets you more engaged."
What does the author say about photo-taking in the past？
A.It was a painstaking effort for recording life’s major events.
B.It was a luxury that only a few wealthy people could enjoy.
C.It was a good way to preserve one’s precious images.
D.It was a skill that required lots of practice to master.
Kristin Diehl conducted a series of experiments on photo-taking to find out __________.A.what kind of pleasure it would actually bring to photo-takers
B.whether people enjoyed it when they did sightseeing
C.how it could help to enrich people’s life experiences
D.Whether it prevented people enjoying what they were doing
What do the results of Diehl’s experiments show that people taking photos？A.They are distracted from what they are doing.
B.They can better remember what they see or do.
C.They are more absorbed in what catches their eye.
D.They can have a better understanding of the world.
What is found about museum visitors with the aid of eye-tracking glasses？A.They come out with better photographs of the exhibits.
B.They focus more on the exhibits when taking pictures.
C.They have a better view of what are on display.
D.They follow the historical events more easily.
What do we learn from the last paragraph？A.It is better to make plans before taking photos.
B.Mental photos can be as beautiful as snapshots.
C.Photographers can derive great joy from the click of the camera.
D.Even the very thought of taking a photo can have a positive effect.
请帮忙给出每个问题的正确答案和分析，谢谢！
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A= A ; 1mA= μA; 1μA= m A= A
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National Geographic【61】fill a number of roles, says Karen Kasmauski. "We are journalists; researcher, thinkers," she says, "photography is our【62】."
As one of the Society's six contributing photographers-in-residence, Karen seeks to focus【63】attention on global changes and how they【64】human health. One promising【65】is the anti-measles【66】in Kenya led by the American Red Cross, the Centers for Disease Control and Prevention, and UN【67】.
"These photographers-in-residence have chosen subjects they've been【68】for years, subjects they're【69】about," says program manager Charlene Valeri. Frans Lanting investigates【70】and the danger of【71】loss to animals in the wild. David Coubilet works to promote the survival of coral reef【72】in the South Pacific. Sam Abell【73】North American rivers from a cultural, historical, and ecological【74】. Underwater photographer Emory Kristof will use【75】-operated vehicles to take inventory of deep ocean【76】in water off Indonesia. Annie Griffiths Belt is promoting【77】of wilderness areas in North America, both in and outside of classrooms. By speaking to【78】and displaying their work widely, the photographers hope to【79】public support for the Society's【80】.
(41)
A．contributors
B．photographers
C．columnists
D．writers
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质量分别为mA和mB（mA＞mB）的两质点A和B，受到相等的冲量作用，则
A、A比B的动量增量少
B、A比B的动量增量多
C、A、B动量增量相等
D、A、B动能增量相等
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TV news agencies turn to freelance cameramen in order to ______.
A．save expense and avoid risks
B．get first-hand information and pictures
C．look for pictures that are of fine qualities
D．buy pictures which are the most stimulating to the senses
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（In spite of) the wonderful music, sensitive photography, and （well-developed) plot, the （
(In spite of) the wonderful music, sensitive photography, and (well-developed) plot, the (three-hours) play could not (hold) our attention.
A．In spite of
B．well-developed
C．three-hours
D．hold
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下列程序执行后的输出结果是（)define MA（x) x*（x-1)main（){int a＝1，b＝2；printf（"%d\n"，MA（1+a+B
下列程序执行后的输出结果是() define MA(x) x*(x-1) main() {int a＝1，b＝2； printf("%d\n"，MA(1+a+B) )； }
A．5
B．6
C．7
D．8
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质量分别为mA和mB的两质点A和B（mA＞mB）, 受到相同的冲量作用，则 [ ]（）
A．A的动量增量比B的动量增量大
B．A的动量增量比B的动量增量小
C．A的动量增量等于B的动量增量
D．无法确定A的动量增量与B的动量增量那个更大一些
-
质量分别为 mA 和 mB （mA ＞ mB ）的两质点 A 和 B ,受到相等的冲量作用，则（）
A．A 比 B 的动量增量少
B．A 比 B 的动量增量多
C．A 、 B 的动量增量相等
D．无法确定
