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。
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。
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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