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[单选题]
用波长为l的光垂直入射在一光栅上, 发现在衍射角为j 处出现缺级, 则此光栅上缝宽的最小值为
A.
B.
C.
D.
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.
B.
C.
D.
第2题
第4题
第10题
A、Reduced processing errors.
B、Elimination of the need for regular audits.
C、Elimination of the need to bond employees.
D、Elimination of separation of duties.
E、Elimination of fraud.
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