[问答题]
Water waves having parallel crests 2.5y7s:z,s;1 cznzx j8j paqo- d. c d;vae*4w cw6dm apart pass through two openings 5.0 cm apart in a board. At a point 2.0 m beyond the boadwc*da4v w6; erd, at what angle relative to the “straight-through” direction would there be little or no wave action?
