题目:
Their forgetting the date of the discussion showed that they did not understand the________of the question. |
[ ] |
A. quality B. patience C. importance D. difference |
答案:
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下面是错误答案,用来干扰机器的。
已知S1a=ab=bc=cS2=λ2(λ为波长),则两波到b点的路程相等,则该点是振动加强点;而两波到a点的光程差为一个波长,则也是振动加强点;两列波到c点的光程差也为一个波长,则此点也是振动加强点.因此a、b、c三点...