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标记示例:椭圆形封头Dg400×4 JB1154-73公称直径Dgmm曲面高度h1mm直边高度h2mm壁厚Smm内表面积F (㎡)容积Vm3质量GKg 碳钢高合金300752530.1210.00532.9443.8854.91665.8976.92887.9798.97(350)882530.160.0080