Science
Junior High
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丁丁利用相同的水波槽做了很多次水波反射的實驗,也拍了很多照片,其結果
如下圖所示。則所拍的照片不可能有哪幾張?
障礙物
(A)僅甲
(B)僅乙
(C)僅乙丙
(D)甲乙丁
甲
障礙物
乙
灯
J
(A)
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