双重壁管弯曲，以保护跨管间距。

Dual wall tube bending to protect inter-tubular spacing.

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目的：研究胃前壁双重相的显示，以及如何更好地显示前壁病变。

Objective:To study the demonstration of the anterior wall of stomach(AWS)by means of double constrast (DC) radiograph, and improve the detectability of the lesion in AWS.

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再采用数值分析方法，包括线性特征值屈曲分析、几何非线性分析及几何、材料双重非线性分析，研究了不同加劲肋对钢筒仓仓壁稳定性能的影响。

The paper analyses the stability of rib slab on method of energy, the formula of longitudinal critical force is deduced, and rational arrangement of stiffening rib is discussed.

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再采用数值分析方法，包括线性特征值屈曲分析、几何非线性分析及几何、材料双重非线性分析，研究了不同加劲肋对钢筒仓仓壁稳定性能的影响。

The paper analyses the stability of rib slab on method of energy, the formula of longitudinal critical force is deduced, and rational arrangement of stiffening rib is discussed.

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