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【单选题】
( cs11 单缝位置) 波长为 480nm 的平行光垂直照射到宽为 0.40mm 的单缝上,单缝后面的凸透镜焦距为 600mm ,当单缝两边缘点 A 、 B 射向 P 点的两条光线在 P 点的相位差为 π 时, P 点离中央中心的距离等于 ________ 。A.
0.36mm
B.
0.40mm
C.
0.48mm
D.
0.60mm
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【单选题】Ned Kelly is a controversial figure because ______.
A.
he committed so many crimes
B.
some people think he is a hero and others think he is a criminal
C.
he killed policemen
D.
he is a criminal but he is coward
【简答题】A．Because their parents die. B．Because the number of divorces has gone up. C．Because people live longer than before. D．Because them are so many unmarried couples.
【单选题】English is considered as a(n) _______ language, and it is no surprise that there are so many peo
A.
34. English is considered as a(n) _______ language, and it is no surprise that there are so many people in the world learning it. A．universal
B.
logical
C.
artificial
D.
Regular
【简答题】I found a website that has changed my life. The website is wishuponahero.com and it is all about people helping others, not expecting anything in return. I am a single mom with a son. My son’s 12th bi...
【简答题】阅读理解。 Canadians like to say 'Thank you' when others help them or say something kind to them. People of many other countries do so, too. It's a very good habit. You should say 'Thank you' when someone ...
【简答题】The world itself is becoming much smaller by using modern traffic and modern communication means （通讯设备）.Life today is much easier than it was hundreds of years ago, but it has brought new problems. On...
【简答题】Passage Two Questions 26 to 30 are based on the following passage. Contrary to what many people believe, highly intelt children are not necessarily bound to have an academic success. In fact, so-...
【简答题】阅读理解。 The suitable clothes can make men handsome and make women attractive, so more and more people spend much money on clothes. Thanks to the fashion designers, many different styles of clothes appea...
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