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【多选题】
在混凝土配合比设计中,水灰比的大小,主要由( )等因素决定。[2分][5分]
A.
设计要求的强度等级
B.
水泥强度
C.
骨料最大粒径
D.
砂的细度模数
E.
砂率
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参考答案：
举一反三
【单选题】光强度与单色器狭缝宽度有关,定性分析时采用的宽度为()
A.
较大
B.
适中
C.
较小
D.
任何都可
查看完整题目与答案
【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。
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【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：
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentences. 7. He always ______ the latest fashions.
A.
commented
B.
appeared
C.
followed
D.
attempted
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentence. 7. Does art ______ society, or shape it?
A.
mirror
B.
admit
C.
inspect
D.
claim
查看完整题目与答案
【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
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentences. 4. Wearing long skirts has become very ______ recently.
A.
frequent
B.
popular
C.
famous
D.
average
查看完整题目与答案
【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
查看完整题目与答案
相关题目：
【单选题】光强度与单色器狭缝宽度有关,定性分析时采用的宽度为()
A.
较大
B.
适中
C.
较小
D.
任何都可
查看完整题目与答案
【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。
查看完整题目与答案
【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：
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentences. 7. He always ______ the latest fashions.
A.
commented
B.
appeared
C.
followed
D.
attempted
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentence. 7. Does art ______ society, or shape it?
A.
mirror
B.
admit
C.
inspect
D.
claim
查看完整题目与答案
【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
查看完整题目与答案
【单选题】Choose the best item to complete each of the following sentences. 4. Wearing long skirts has become very ______ recently.
A.
frequent
B.
popular
C.
famous
D.
average
查看完整题目与答案
【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
查看完整题目与答案
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