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3 cm、5 cm同轴热噪声基准操作技术规范
Operating Technical Norm of 3cm、5cm Coaxial Thermal Noise Primary Standard
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医用超声治疗机超声源检定规程
Verification Regulation of the Ultrasonic Source of Ultrasonic Therapeutic Equipment for Medical Use
价格：￥0.00
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标准仿真乳突检定规程
Verification Regulation of Standard Artificial Mastoids
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HP8971C型噪声系数测试装置试行检定规程
价格：￥0.00
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XFC-2型标准信号发生器(试行)
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4221型高声压传声器校准仪试行检定规程
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925D/2型彩色视频噪声测量仪试行检定规程
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