To study the efficiency evaluation of electromagnetic spectrum management in the complicated electromagnetic environment, a systemic evaluation solution is put forward.
针对复杂电磁环境下的电磁频谱管理效能评估问题，提出一套系统地效能评估方法。
After surveying the operational aspect and production efficiency of the pilot-plant, integrating systemic analyses of the existing plant, the design was modified.
考察装置的运行状况与生产效率，并结合对现有装置的分析，改进设计方法。
Using the method combining systemic sampling and cluster sampling together, we select 972 persons to be the inquisition object, collecting 890 valid questionnaire, with 91.6% efficiency .
调查采用分层整群抽样的方法，选取972人作为调查对象，得有效调查问卷890份，有效率为91.6%。
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