types of steel permissible for 容许的钢材类型 vessels subjected to external pressure 承受外压的容器 Surface Weld Metal Buildup 金属堆焊表面 ..
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... unreinforced 非补强的 vessels subjected to external pressure 承受外压得容器 Nozzles attachment of to shell 接管,与壳体的连接 ...
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