refraction seismographic instrument
折射地震仪
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阴极射线管折射地震仪 cathode-ray tube refraction seismograph
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用DFS-v地震仪辅助道记录折射地震信号的方法在国内尚属首次采用。
The method of recording refractive seismic signals by an auxiliary channel of the DFS- V seismic system is adopted for the first time at home.
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