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If you happen to meetJames in Vancouver,the book to him. A.give B.you give C.gave D.you would give

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Please write your name inthe_________space at the top of the page. A.empty B.vacant C.blank D.hollow

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两列相干的平面简谐波振幅都是4cm,两波源相距30cm,相位差为π,在两波源连线的中垂线上任意一点P,两列波叠加后合振幅为: A.8cm B.16cm C.30cm D.0

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