根据复杂山区地形的特点，以箱模式为基础，引入地形修正系数，建立梯形模型。
Echelon model was built based on the box model and imported modified terrain coefficient, according to the characteristic of mountainous area.
根据复杂山区地形的特点，以箱模式为基础，引入地形修正系数，建立梯形模型。
Echelon model was built based on the box model and imported modified terrain coefficient, according to the characteristic of mountainous area.
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