主放大采用了比例放大，带宽更宽，记录到的地倾斜信息更丰富，能够很好的应用于地震预报工作。
The main amplifier USES proportion enlargement, widening the bandwidth, recording richer earth decline information, which can be well used in the earthquake forecast.
性能只依赖于带宽和屏幕象素的比例；
Performance depends only on the ratio of bandwidth to pixels on the screen.
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