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。
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。
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.
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