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直流四探针电阻率测试仪通用技术条件
Generic specification of resistivity measuring instrument with four-point probe
价格:¥0.00
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电话电声测试仪
Verification Regulation of Electro-acoustical Measuring Instrument for Telephone Sets
价格:¥0.00
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直流光电放大式检流计
d.c. photoelectric amplifier galvanometer
价格:¥0.00
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直流电子放大式检流计
d.c. electronic amplifier galvanometer
价格:¥0.00
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实验室直流电阻器
Laboratory d.c. resistors
价格:¥0.00
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