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80-325 mesh gypsum mill, uniform discharge, stable performance, optional 1-20 tons per hour!

80-325 mesh gypsum mill, uniform discharge, stable performance, optional 1-20 tons per hour!

Jan 26, 2020 Aug 15, 2013 A frequency band is said to be an octave in width when its upper band-edge frequency, f 2, is twice the lower band-edge frequency, f 1: f 2 = 2 f 1. Each octave band is named for its center frequency (geometric mean), calculated as follows: f c = (f 1 f 2) 1/2, where f c = center frequency and f 1 and f 2 are the lower and upper frequency band

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