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【简答题】
波长为600nm的单色光垂直入射在一光栅上，第二、第三级主极大明纹分别出现在sinθ=0.2及sinθ=0.3处，第四级缺级，求： （1）光栅常数； （2）光栅上狭缝的宽度； （3）屏上一共能观察到多少根主极大明纹？
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举一反三
【单选题】Which is the main idea about students in the 1960s?
A.
They took part in protests.
B.
They enjoyed their time at university.
C.
They read books which were forbidden.
D.
They smoked marijuana.
【单选题】Which is the main idea about students in the 1960s?
A.
They smoked marijuana.
B.
They took part in protests.
C.
They read books which were forbidden.
D.
They enjoyed their time at university.
【单选题】What do we call the collection of businesses and products that make up the company?
A.
business portfolio
B.
investment diversity
C.
departments
D.
needs inventory
E.
none of the above
【单选题】一种筛检乳腺癌的实验应用于已经病理检查证实的乳腺癌病人400人和未患乳腺第400人。结果患癌组有100例阳性,未患癌组有50例阳性。则该试验的特异度为
A.
100/400
B.
350/400
C.
100/150
D.
100/300
E.
50/400
【单选题】一种筛检乳腺癌的实验应用于已经病理检查证实的乳腺癌患者400人和未患乳腺癌400人。结果患癌组有100例阳性,未患癌组有50例阳性。该试验的灵敏度为( )
A.
100/400
B.
350/400
C.
100/150
D.
100/300
E.
350/650
【简答题】数据的完整性指数据的正确性、有效性、 。
【单选题】Which is the main idea about the students in the 1960s?
A.
They smoked marijuana.
B.
They took part in protests.
C.
They read books which were forbidden.
D.
They enjoyed their time at university.
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