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【单选题】
波长λ=600nm的单色平行光垂直入射到一块衍射光栅上，第二、三级主极大明纹分别出现在衍射角【图片】、【图片】 满足下式的方向上，即【图片】、【图片】，第四级缺级。在观察屏上可能出现的全部主极大明纹的级次为A.
0， ± 1， ± 2， ± 3， ± 5， ± 6， ± 7， ± 9
B.
0， ± 1， ± 3， ± 5， ± 7
C.
0， ± 1， ± 2， ± 3， ± 5， ± 6， ± 7， ± 8， ± 9
D.
0， ± 1， ± 2， ± 3， ± 5， ± 6， ± 7
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