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D90 ≤ 15µm
15µm＜ D90 ≤ 25µm
25µm ＜ D90 ≤ 60µm
60µm ＜ D90 ≤ 100µm
100µm ＜ D90 ≤ 200µm
200µm ＜ D90 ≤ 300µm
300µm ＜ D90 ≤ 700µm
D90 ＞ 700µm