The apparatus includes an accessor, a pinion and a rack having a straight section and a curved section.

所述装置包括：存取器、小齿轮和具有直线段和曲线段的齿条。

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For the experimental pipe sections, grid models of the entrance straight section and the bend section are established respectively.

针对实验管段，分别建立入口直管和弯管的网格模型。

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For the experimental pipe sections, grid models of the entrance straight section and the bend section are established respectively.

针对实验管段，分别建立入口直管和弯管的网格模型。

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