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某同学做双缝干涉实验，开始两缝宽度相等，出现了清晰的干涉条纹；然后他将其中一缝的宽度略微调窄，且保持两缝的中心位置不变，则（）。
A.干涉条纹间距变宽B.干涉条纹间距变窄C.干涉条纹间距不变D.不能发生干涉现象
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