关于波面与波线About Wave Surface and Wave Line
A: 波面处处与波线平行；The Wave Surface is parallel to the Wave Line everywhere;
B: 波面处处与波线不一定平行；The Wave Surface is not always parallel to the Wave Line;
C: 波面处处与波线垂直；The Wave Surface is everywhere perpendicular to the Wave Line;
D: 波面处处与波线不一定垂直；The Wave Surface is not always perpendicular to the Wave Line;
A: 波面处处与波线平行；The Wave Surface is parallel to the Wave Line everywhere;
B: 波面处处与波线不一定平行；The Wave Surface is not always parallel to the Wave Line;
C: 波面处处与波线垂直；The Wave Surface is everywhere perpendicular to the Wave Line;
D: 波面处处与波线不一定垂直；The Wave Surface is not always perpendicular to the Wave Line;
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