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教学用单踪阴极射线示波器
Teaching single trace cathode - rad oscilloscope
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教学用电子仪器的标志、说明书、包装、运输和贮存通用技术条件
General specifications for marking. instruction manual. package. transportation and storage of electronic teaching instruments
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教学用电子仪器的环境要求和实验方法
Quality inspection provisions and test methods for the electronic teaching instruments
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平面几何演示器
The plane geometry demonstrator
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初中化学实验箱
Chemical experimental kits for junior secondary schools
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立式隔膜电解槽技术条件
Technical specifications of vertical electrolysers with the block membrane
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矿物岩石标本
Samples of minerals & rocks
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月球运行仪技术条件
Technical specifications of the moon's motion instrument
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透明天球仪
The transparent celestial globe
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教学仪器设备产品的检验规则
Testing regulations for educational equipment products
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