兑水 发表于 2009-9-6 14:53:26

ASTM A 343-2003在电力频率下用瓦特计-安培计-伏特....

A343/A343M-03 Standard Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame
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