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【单选题】
人们道德素质的高低主要取决于（）。A.
道德行为
B.
道德评价
C.
道德教育
D.
道德修养
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反馈参考答案：
举一反三
【简答题】在宽度为a=0.60mm的狭缝后放置一焦距f=40cm的会聚透镜，若以单色平行光垂直照射狭缝，则在置于透镜主焦平面处的屏幕上x=1.4mm处的P点看到衍射明条纹，求 (1)入射光的波长以及P点衍射条纹的级数； (2)在该衍射条件下，缝面可分成的半波带数； (3)中央明条纹的宽度以及第二级明纹对应的衍射角。
【简答题】利用波长为λ=0.59μm的平行单色光照射光栅，已知光栅上每毫米宽度内刻500条狭缝，透光狭缝宽度a=1×10 -3 mm．试求：
【单选题】PartI Vocabulary & Structure ( 25 points, 1 point for each item) Se c tion A Directions: There are 15 incomplete statements here. Complete each statement by choosing the appropriate answer from the 4 ...
A.
out, for
B.
off ,to
C.
out, in
D.
away, on
【单选题】下列有关准直器的描述，错误的是
A.
准直器狭缝宽度决定线束宽度
B.
准直器狭缝宽度决定扫描层厚
C.
准直器窗口呈狭缝状态
D.
准直器狭缝宽度决定扫描层距
E.
准直器位于X线窗口前端
【单选题】Section two Part 3 News item 2 B: listen to the news item again and choose the best answer to complete each of the following sentences. 1 Oppositions parties are demanding 1 after a violent protest ov...
A.
a new election
B.
a new selection
C.
a new elector
D.
a new selector
【单选题】Directions: Listen to the news item and complete the following summary. Choose the best answer to complete each of the following sentences. [音频] This news item is about 1) ________.
A.
the violent protest over voting problems in Yemen
B.
the local council election in Yemen
C.
the ruling General People's Congress Party in the lead
D.
the people killed and injured during the voting in Yemen
【单选题】单色光的纯度可用仪器的狭缝宽度调节,宽度增加将会使( )
A.
单色光的纯度变差，测定灵敏度下降
B.
单色光的纯度变好，测定灵敏度下降
C.
单色光的纯度变差，测定灵敏度提高
D.
单色光的纯度变好，测定灵敏度提高
【单选题】Choose the best item to complete each of the following sentences. 1、 There’s no supermarket in the _____ area.
A.
immediate
B.
temporary
C.
recent
D.
brief
【单选题】Choose the best item to complete each of the following sentence. 6.This sentence doesn't make any______.
A.
benefit
B.
sense
C.
help
D.
meaning
相关题目：
【单选题】下列有关准直器的描述，错误的是
A.
准直器狭缝宽度决定线束宽度
B.
准直器狭缝宽度决定扫描层厚
C.
准直器窗口呈狭缝状态
D.
准直器狭缝宽度决定扫描层距
E.
准直器位于X线窗口前端
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