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“DB/T”表示()
- A、推荐性地方标准代号
- B、强制性地方标准代号
- C、推荐性行业标准代号
- D、推荐性国际标准代号
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JB/T8467-96标准规定:若用底面横波反射法调节探伤灵敏度,对于实心锻件可采用下列哪一公式计算增益值()A、△dB=20 lg2λT/πØ2B、△dB=10 lg2λT/πØ2C、△dB=20 lgπØ2/2λTD、△dB=10 lgπØ2/2λT
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单选题JB/T8467-96标准规定:若用底面横波反射法调节探伤灵敏度,对于实心锻件可采用下列哪一公式计算增益值()A
△dB=20 lg2λT/πØ2B
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