结果：与经典方法相比较，由于减半取样，缩短了滤过时间，使本法更加合理、迅速、结果准确。
Results: Compared with classical methods, this method was more reasonable, rapid and accurate, because of shortening the filter time by reducing half of the number of sample.
结果：与经典方法相比较，由于减半取样，缩短了滤过时间，使本法更加合理、迅速、结果准确。
Results: Compared with classical methods, this method was more reasonable, rapid and accurate, because of shortening the filter time by reducing half of the number of sample.
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