双频
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DF DoubleFrequency 倍频
optimal length of doublefrequency crystal 最佳倍频晶体长度
Doublefrequency and threefrequency ultrasonic irradiation can significantly improve sonochemical yield with remarkable enhancement effects.
双频、三频正交超声辐照能显著地提高声化学产额，具有明显的增强效应。
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