It has been developed for the improvement of the digital seismic station, and is an alternate production of the model JD-2 deep well seismometer.
它是为井下地震台的数字化改造而研制的,是JD - 2型地震仪的替代产品。
The model JD-2F bore-hole seismometer has been successfully developed on the basis of the model JD-2 deep well seismometer after improving technology and introducing electronic feedback technology.
JD - 2f型井下地震计是在JD - 2型深井地震仪的基础上,经过进一步的技术改进并引入电子反馈技术而研制成功的。
A seismometer is a seismograph whose physical constants are so well known.
地震计是一种地震仪器,其物理常数是已知的。
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