缩短了实验周期，提高了氮的回收率。
The experiment period is shorten and the recovery rate of nitrogen is improved.
同时他们也打算将实验周期由6个月缩短为3个月。
They also want to shorten experiments to three months rather than six.
但吸附柱法实验周期太长，分批测定法仍具有不可取代的位置。
But the experiment cycle of column method is so long that batch method cannot be substituted yet.
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