sigh007 发表于 2012-3-27 00:23:41

MIL-STD-1621A


                   MIL-STD-1621A, MILITARY STANDARD: ACOUSTICAL AND VIBRATIONAL STANDARD REFERENCE QUANTITIES (27 AUG 1973) ., This standard covers reference quantities to be used in reporting of all acoustical and vibrational quantities expressed in terms of levels.         
         
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