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【单选题】
关于缺级条件 ,以下错误的是A.
光栅常数d表示缝间距，a表示单缝的宽度
B.
k为多缝干涉主极大级数，k'为单缝衍射暗条纹级数
C.
k'从1开始，凡是符合缺级公式的整数（k）级明条纹会缺失
D.
如果d/a=3,则单缝衍射主极大范围内有4条谱线
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反馈参考答案：
举一反三
【单选题】The author says that in the current world, Sesame Street______.
A.
has slight edge over other shows targeting children
B.
has made some changes so as to keep up with the times
C.
tries to cater to adults who accompany their children to the show
D.
is doomed to fail due to its out-dated content and presentation
【简答题】Why has “Sesame Street” been called “the longest street in the world”?
参考解析：
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