At the point of manufacture, the diaphragm sealing surface of the flange on the valve body receives special preparation to enhance sealing with PTFE diaphragms.是什么意思_At the point of manufacture, the diaphragm sealing surface of the flange on the valve body receives special preparation to enhance sealing with PTFE diaphragms.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句