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並前往https://www.yumpu.com/en/document/view/18409186/standard-test-methods-for-determining-average-grain-size

Standard Test Methods for Determining Average ... - Yumpu

D¯ = mean spatial (volumetric) grain diameter. f = Jeffries multiplier for planimetric method. G = ASTM grain size number. !¯ = mean lineal intercept length.

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