標題: ASTM A 912-2004 用萬用表環形樣品法測試非晶材料在電頻率... [打印本頁] 作者: 兌水 時間: 2009-9-10 07:54 標題: ASTM A 912-2004 用萬用表環形樣品法測試非晶材料在電頻率... A912/A912M-04 Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Toroidal Specimens