综观国内外各类文献资料，很难查到平垫自紧密封结构应用于换热器管板密封的工程实例。
It is difficult to find out an engineering example that plain cushion self-tight seal applied to tubesheet seal in domestic and overseas references.
综观国内外各类文献资料，很难查到平垫自紧密封结构应用于换热器管板密封的工程实例。
It is difficult to find out an engineering example that plain cushion self-tight seal applied to tubesheet seal in domestic and overseas references.
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