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介绍了大连地震台通过对ＤＫ－１测震仪垂直摆的改造，提高了摆的周期，使得仪器更加稳定，经几年的观测记录结果看，这些方法是有效的．
This paper introduces that Dalian Seismic Station improved the vertical pendulum of DK-1 seismometer and improved the pendulum’s cycle, making the instrument more stable. These methods are effective after several years of observations.