已知某材料的密度为2.50g/cm32.50g/cm^{3}2.50g/cm3,视密度为2.20g/cm32.20g/cm^{3}2.20g/cm3,表观密度为2.00g/cm32.00g/cm^{3}2.00g/cm3。试求该材料的孔隙率、开口孔隙率和闭口孔隙率。
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