Some improvements for mechanical seals on mid-pressure ammonia pumps in our plant is summarized,A performance contrast is analysed and some application recommendations are given in future service preferentially for the metal bellow type mechanical seals.是什么意思_Some improvements for mechanical seals on mid-pressure ammonia pumps in our plant is summarized,A performance contrast is analysed and some application recommendations are given in future service preferentially for the metal bellow type mechanical seals.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句