兑水 发表于 2009-9-12 09:37:26

ASTM B 311-1993 孔隙度小于2％的粉末冶金材料密度的标准...

B311-93(2002)e1 Test Method for Density Determination for Powder Metallurgy (P/M) Materials Containing Less Than Two Percent Porosity
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