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。
All are made of reinforced concrete structures reinforced HPB235 and HRB335 foundation will use C25 concrete with 100 mm of C15 cushion plain concrete.
所有钢筋混凝土构件均采用HPB235和HRB335钢筋，基础采用C25混凝土，垫层采用100毫米后c 15素混凝土。
All are made of reinforced concrete structures reinforced HPB235 and HRB335 foundation will use C25 concrete with 100 mm of C15 cushion plain concrete.
所有钢筋混凝土构件均采用HPB235和HRB335钢筋，基础采用C25混凝土，垫层采用100毫米后c 15素混凝土。
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