Set the height of accelerating section and decelerating section, ratio of pipe-diameter as alterable parameter, the mathematic model of structure optimization was established.
将加速段、减速段高度及其管径比作为可变参数，建立了结构优化数学模型。
Set the height of accelerating section and decelerating section, ratio of pipe-diameter as alterable parameter, the mathematic model of structure optimization was established.
将加速段、减速段高度及其管径比作为可变参数，建立了结构优化数学模型。
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