NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
SJ 445-1973
高壓整流管陰極脈衝放射電流和欠熱陰極脈衝放射電流的測試方法 Methods of measurement for cathode pulse emission current and cathode pulse emission current on underheated condition of high-voltage rectifier tubes
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The Standardization Administration of the People's Republic of China