G ra de-N Division in working area is concluded on the basis of formed combined index, and critical zone alignment is determined according to both combined index feature and single index feature.
在所形成的综合指标基础上，作者又归纳了一种对研究地区进行多级划分的方法，并确定了基于综合指标数字特征和单指标数字特征的临界区间序列。
G ra de-N Division in working area is concluded on the basis of formed combined index, and critical zone alignment is determined according to both combined index feature and single index feature.
在所形成的综合指标基础上，作者又归纳了一种对研究地区进行多级划分的方法，并确定了基于综合指标数字特征和单指标数字特征的临界区间序列。
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