题目内容：
在单缝夫琅和费衍射实验中，屏上第三级明纹对应的缝间的波振面，可划分为半波带数目为（ ）个。
A．5 B．6
C．7
D．8
参考答案：
答案解析：
单选题：在单缝夫琅和费衍射实验中，屏上第三级明纹对应的缝间的波振面，可划分为半波带数目为（ ）个。
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- 题目类型：单选题
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B．6
C．7
D．8
B．6
C．7
D．8
两列相干平面简谐波振幅都是4Cm，两波源相距30Cm，相位差为π，在波源连线的中垂线上任意一点P，两列波叠加后的合振幅为
两列相干平面简谐波振幅都是4Cm，两波源相距30Cm，相位差为π，在波源连线的中垂线上任意一点P，两列波叠加后的合振幅为（ ）Cm。 A．8 B．16 C．3
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一平面简谐波沿x轴正向传播，振幅为A=0.02m，周期T=0.5s，波长λ=100m，原点处质元初相位φ=0，则波动方程的表达式（ ）。
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I am looking forward to_________from you as soon as possible.A．hear B．be hearing
By sending this letter, the writer expected to
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According to the passage, we give school children difficult
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