对ERT系统的多种激励模式作了介绍和特性比较，主要从敏感场的敏感性和发散性两个指标衡量各种激励模式的性能。
Various exciting modes of ERT system are introduced and compared in characteristics, and the performance of each mode is mostly judged by the sensitivity as well as the divergence of sensing field.
并以鄱阳湖为例，运用物元理论进行指标体系生成的发散过程，形成了初始指标集。
As a case study of Poyang Lake, the divergent process of the indicator system formation has been made to establish the initial indicator set by using the matter-element theory.
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