A:衍射现象中衍射花样有暗条纹的出现是光的叠加的结果
B:双缝干涉中也存在着光的衍射现象
C:影的存在是一个与衍射现象相矛盾的客观事实
D:一切波都可以产生衍射
— The storybook is very interesting.
— I agree with you. I ______it twice already.
Tom ____ ____to Jack's birthday party yesterday.