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【判断题】
有极性电容器管脚长短可用来区分电容正负极,其中长脚为正,短脚为负。A.
正确
B.
错误
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【简答题】一束准直的单色光正入射到一个直径为1cm的会聚透镜，透镜焦距为50cm，测得透镜焦平面上衍射图样中央亮斑的直径是0.00666cm，则光长为 nm。
【单选题】Marx called ____ “the real father of English materialism and experimental science of modern times in general.”
A.
Edmund Spencer
B.
Ben Jonson
C.
Francis Bacon
D.
Christopher Marlowe
【简答题】Do you think Christopher Reeve is a superhero in the real life? Why or why not?
【单选题】Choose the best answer to each of the following questions or statements according to the text. Christopher Nolan’s epic, visionary science fiction adventure puts on the screen some of the most amazing...
A.
serves as a science textbook on space
B.
puts a lot of effort into its visual effects
C.
is based on Nolan's space adventure
D.
receives an award as the best movie
【简答题】一束准直的单色光正入射到一个直径为1cm的会聚透镜，透镜焦距为50cm，光长λ=546nm，则透镜焦平面上衍射图样中央亮斑的直径是( )。
【简答题】一束准直的单色光正入射到一个直径为 1cm 的汇聚透镜,透镜焦距为 50cm ,测得透镜焦平面上衍射图样中央亮斑的直径是 cm ,则光长为 nm 。
【简答题】_______ was a German businessman and a pioneer in the field of archaeology. His findings confirm the real existence of Troy, which was, for a long time, regarded as the kingdom of literary fiction by ...
【简答题】一束准直的单色光正入射到一个直径为1cm的会聚透镜，透镜焦距为50cm，测得透镜焦平面上衍射图样中央亮斑的直径是6.66×10 -3 cm，则光长为______nm．
【简答题】Children in the United States learn that Christopher Columbus (1) ______________________ , but since there were already millions of people (2)____________________________ when he arrived, what is Colu...
【单选题】_______ was a German businessman and a pioneer in the field of archaeology. His findings confirm the real existence of Troy, which was, for a long time, regarded as the kingdom of literary fiction by ...
A.
Heinrich Schliemann
B.
Christopher Marlowe
C.
Doctor Faustus
D.
Wolfgang Petersen
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