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【单选题】
在双缝干涉实验中,为使屏上的干涉条纹间距变大,可以采取的办法是()。
【单选题】
双缝干涉实验中,如果拉大光屏与双缝之间的距离D,则条纹间距x将()。
【单选题】
在单缝夫琅和费衍射中,与低级数的衍射条纹相比,高级数的衍射条纹对应着单缝处的半波带数()
【单选题】
某光栅条纹密度是100条/mm,光栅条纹间夹角θ=0.001孤度,则莫尔条纹的宽度是()。
【单选题】
某光栅的条纹密度是100条/mm,光栅条纹间的夹角0.001弧度,则莫尔条纹的宽度是()
【单选题】
用单色光照射光栅,屏幕上能出现的衍射条纹最高级次是有限的为了得到更高衍射级次的条纹,应采用的方法是()
【单选题】
在光栅式位移传感器中,莫尔条纹与光栅条纹的排列方向几乎成?(????)
【单选题】
已知牛顿环两两相邻条纹间的距离不等.如果要使其相等,以下所采取的措施中不可行的是()
【单选题】
The engineers are going through with their highway project, ____the expenses have risen.
【单选题】
A police officer claimed he had attempted to ____ paying his fare.
【单选题】
The students were not____ to leave the classroom without an adequate reason.?
【单选题】
It was a minor illness, and she soon ____ it. ?
【单选题】
Our English teacher demanded that we ____ to English broadcast every day.
【单选题】
He ____ have left the campus, for I saw in the classroom just a minute ago
【单选题】
The manager will visit your parents ____ person. ?
【单选题】
There isnt any difference between the two. I really dont know ____.
【单选题】
If we hadn’t got a lift, we ____ the top flat so soon.
【单选题】
With the old man____ the way, we had no trouble in finding that mysterious cave.