And according to its origin, it can be divided into direct measurement parameter and the derivation parameter.
参数数量很多，按其来源可以分为直测参数和派生参数。
There are collective parameter method which is adopted in lightning protection rules, direct measurement method, electromagnetic field method and so on.
国内外对此的研究，主要有集中参数法(我国防雷规程采用)、直接测量法及电磁场法等方法。
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