Aerospace series - Test methods for aluminium and aluminium alloy products - Part 7: Reference blocks for the calibration of measuring equipment used in the determination of electrical conductivity of wrought aluminium and aluminium alloys; German and English version EN 2004-7:2017
航空航天系列.铝和铝合金产品的试验方法.第7部分:用于测定锻铝和铝合金导电性的测量设备校准用参考试块;德语和英语版本EN 2004-7:2017