Finally, the paper makes comparison and choice of the evaluating standard of the power frequency electric field, and brings forward more objective standard.
最后，本文对工频电场的评估标准进行了比较与选择，并提出了较为客观的依据标准。
The comparison table of modern practical atom clock's performance index is given. The index of transferring and comparing standard time-frequency signal by modern radio means is also listed.
给出了现代实用型原子钟的性能指标比较表，和用现代无线电手段传递、比对时频标准信号达到的指标。
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