標題: ASTM A 343-2003在電力頻率下用瓦特計-安培計-伏特.... [打印本頁] 作者: 兌水 時間: 2009-9-6 14:53 標題: ASTM A 343-2003在電力頻率下用瓦特計-安培計-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