ASTM E1065 Evaluating Characteristics of Ultrasonic Search Units
ASTM E1324 Measuring Some Electronic Characteristics of Ultrasonic Examination Instruments
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本帖最后由 liuhonghui 于 2015-11-27 12:55 编辑
ASTM E1065 Evaluating Characteristics of Ultrasonic Search Units
ASTM E1324 Measuring Some Electronic Characteristics of Ultrasonic Examination Instruments