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GB/T 6983-2022 電磁純鐵 Magnetic iron2023-05-31

YB/T 5261-1993變形鐵鉻鈷永磁合金Wroughtiron-chromium-cobalt permanent magnet alloys2022-06-16

SJ 1546-1979CK-140B型連續(xù)波磁控管Continuous wave magnetrons Type CK-140B2022-06-14

GB/T 14108-2011船用A級(jí)磁羅經(jīng)Marine magnetic compass of class A2022-06-09