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【简答题】
在等倾干涉实验中,若照明光波的波长λ=600nm,平板的厚度h=2mm,折射率为n=1.5,其下表面折射率介质nH>1.5,问(1)在反射光方向观察到的圆条纹中心是暗还是亮?(2)由中心计算,第10个亮纹的半径是多少(观察望远物镜的焦距为20cm)?
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举一反三
【单选题】What are the three general purposes for giving speeches?
A.
To persuade, act , & adjust your speaking style
B.
To inform, persuade, & entertain
C.
To inform, make people laugh, & have fun
D.
None of the Above
【多选题】下列属于我国著名的流纹岩地貌景观有(p81
A.
浙江雁荡山
B.
神仙居
C.
仙都峰
D.
四川九寨沟
E.
黄龙
【单选题】2,2,6,12,27,( )
A.
42
B.
50
C.
58.5
D.
63.5
【单选题】According to the passage, successful game strategy depends on______.
A.
the ability to adjust one's behavior. in light of the behavior. of others
B.
one's awareness that there is safety in numbers
C.
the degree of stability one can create in one's immediate environment
D.
the accuracy with which one can predict future events
【单选题】以下理财目标不属于家庭与事业形成期的是
A.
减轻债务、增加财富积累
B.
提升生活质量
C.
提升教育层次
D.
成家立业
【单选题】选择一个选项将该句补充完整:We are very sorry that the product you bought is sold_____. Would you mind exchanging it to others in our store?( )
A.
off
B.
away
C.
out
D.
on
【单选题】下列哪种酶与切除修复无关?( )
A.
DNA聚合酶Ⅰ
B.
特异的核酸内切酶
C.
5'-核酸外切酶
D.
连接酶
E.
引物酶
【单选题】It is difficult to ________ the sample that is on the slide unless the microscope is adjusted properly.
A.
overlook
B.
discern
C.
disclaim
D.
distract
【单选题】— Is Nie’er Library ______ to ordinary people? — Of course.
A.
accessible
B.
available
C.
reasonable
D.
adjustable
【简答题】计算: (1) 12 - 27 (2) 6 × 15 × 10 (3) ( 2 +2 3 )( 2 -2 3 )
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