Full face gaskets extending to the flange face edge as given in american Standard Non-Metal Gaskets for Pipe Flanges aNSI B16.21 are required. Metal gaskets should not be used.是什么意思_Full face gaskets extending to the flange face edge as given in american Standard Non-Metal Gaskets for Pipe Flanges aNSI B16.21 are required. Metal gaskets should not be used.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句