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【单选题】
某显微镜物镜的看成是薄透镜，物镜通光直径是6mm，工作距离1.5mm，物方介质是折射率为1.333的水，求数值孔径。A.
1.192
B.
2.666
C.
1.298
D.
以上都不对
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【单选题】Beijing is well ______ its beautiful scenery and the Great Wall.
A.
known as
B.
known to
C.
known about
D.
known for
【单选题】Transfer payments are payments by ( ).
A.
gold
B.
cash
C.
silver
D.
financial instruments
【单选题】Mary is an American schoolgirl. She is now in Beijing with her parents. Mary doesn't know Chinese, but she is trying to learn and speak it. She often tries to speak Chinese to her Chinese friends. Som...
A.
English
B.
American
C.
Chinese
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【简答题】阅读理解。 Mary is an American schoolgirl. She is now in Beijing with her parents. Mary doesn't know Chinese. But she is trying to learn and speak it.She often tries to speak Chinese to Chinese very well. ...
【简答题】Mary is an American girl. She is now in Beijing with her parents. Mary doesn’t know much Chinese, but she is studying it. She often speaks Chinese with her Chinese friends. Sometimes they can’t unders...
【简答题】Mary is an American schoolgirl. She is now in Beijing with her parents. She doesn't know Chinese, but she is trying to study and speak it. She often tries to speak Chinese to her Chinese friends. Some...
【单选题】Transfer payments
A.
a. are payments that flow from government to households.
B.
b. are not made in exchange for currently produced goods or services.
C.
c. alter household income, but they do not reflect the economy’s production.
D.
d. All of the above are correct.
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