弯管中性线与内外拱间的面积压力差及其经向等效弯矩
만관중성선여내외공간적면적압력차급기경향등효만구
The Force Difference and its Meridian Equi-moment Induce by the Inside Surface Difference between Flank-extrados and Flank-intrados of Loop under Internal Pressure
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