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【简答题】
组装活塞环时,各道环的开口方向
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【单选题】用波长λ = 500 nm 的单色光垂直照射在每厘米 2000 条刻痕的光栅上,第五级明纹对应的衍射角为( )
A.
30 ° ；
B.
45 ° ；
C.
60 ° ；
D.
90 ° ；
【单选题】According to the passage, criticism of free market solutions in education arises from the fact that___________
A.
their values are too subjective
B.
the educational context is not a free market
C.
they do not explain why their set of values are better than others
D.
their values are too different from those within an educational context
【单选题】Nowadays, children are ________ too many violent online games, which is bad for the development of their characters.
A.
defeated by
B.
limited to
C.
handled by
D.
exposed to
【单选题】Disadvantages as they have, online games never fail to _____ a large number of teenagers．
A.
appeal to
B.
object to
C.
refer to
D.
turn to
【单选题】A land free from destruction, plus wealth, natural resources, and labor supply--all these were important factors, in helping England to become the center for the Industrial Revolution. (31) they were ...
A.
But
B.
And
C.
Besides
D.
Even
【简答题】用波长λ=500nm的单色平行光垂直照射到每厘米1000条缝的衍射光栅上，光栅距屏100cm，求第二级光谱线与中央明条纹的距离．
【单选题】用波长为λ=500nm的单色光垂直照射如图的劈尖膜(n 1 >n 2 >n 3 ,n 2 =1),观察反射光干涉。则下列说法中正确的是:
A.
该劈尖的棱边条纹为明纹;
B.
任意相邻的明条纹中心所对应的膜厚之差都为250nm;
C.
从劈尖的棱边开始算起,第二条明纹中心所对应的膜厚度为500nm。
D.
劈尖干涉为等厚干涉。
【单选题】----Many online games are full of violence, which do harm to the development of the children. ----And that’s _______ my concern lies.
A.
what
B.
which
C.
where
D.
that
【简答题】一衍射光栅，当用波长λ=500nm的单色平行光垂直入射时，第四级主极大明纹的衍射角为30°，第五级主极大明纹恰好首次缺级，则该光栅每毫米有多少条刻痕?每一狭缝宽度是多少毫米?
相关题目：
【单选题】用波长λ = 500 nm 的单色光垂直照射在每厘米 2000 条刻痕的光栅上,第五级明纹对应的衍射角为( )
A.
30 ° ；
B.
45 ° ；
C.
60 ° ；
D.
90 ° ；