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【单选题】
两满足干涉的必要条件是()A.
同频率、同振动方向，有固定的相位差
B.
同频率、同传播方向，有固定的相位差
C.
同频率、同振幅，同相位
D.
同振幅、同振动方向，同相位
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【简答题】None of us are close friends but we all an interest in sports.
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