题目内容

It's getting colder by the minute.If we don't do something soon, We'll all __1__ to death.Prince Hans... - Princess Anna is...Dead. What...?What happened to her?She was killed by Queen Elsa.Her own sister.At least we got to say our marriage __2__...before she died in my arms.There can be no doubt now,Queen Elsa is a monster and we are all in __3__danger.Prince Hans, Arendelle looks to you.With a heavy heart,I charge Queen Elsa of Arendelle with __4__and sentence her to death.Hurry Up!She's dangerous. Move quickly and be careful.The Door not open!What is it, __5__? Hey, watch it.What's wrong with you?I don't understand you when you talk like that.Ah! Stop it! Put me down!No, Sven! We're not going back!She's with her true love.What the...Anna!Come on,come on ,boy.

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在单缝夫琅禾费衍射实验中波长为λ的单色光垂直入射到单缝上.对应于衍射角为30°的方向上,若单缝处波面可分成 3个半波带,则缝宽度a等于 [].

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D. 6λ

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