天花造型角 ( LIGHT TROUGHS ),装饰建材代理加盟,八方资源网..
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If two light waves are coherent, the waves have the same frequency, and the peaks and troughs of light waves are exactly aligned with one another.
如果两束光是相干光,那么它们具有相同的频率,并且相互间的波峰和波谷步调一致。
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