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The national standard is the general standard of ultrasonic testing for steel castings.
本标准系铸钢件超声探伤的通用标准。
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Ultrasonic testing technology is an economic and efficient NDT method.
超声检测是一种经济有效的无损检测手段。
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Ultrasonic testing technology is an economic and efficient NDT method.
超声检测是一种经济有效的无损检测手段。
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