Popping frequency (11) The lowest resonance of a brass instrument mouthpiece.
突出频率(11)铜管乐器吹嘴的最低共振频率。
A thin board forming the upper portion of the resonant chamber in an instrument, such as a violin or piano, and serving to increase resonance.
乐器的共鸣箱的上面部分的一种薄板，如小提琴或钢琴中者，用于增大响亮程度。
A new method for measuring waveguide wavelength using microwave paramagnetic resonance instrument was studied.
探讨了一种利用微波顺磁共振仪测量波导波长的方法。
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