This paper expatiates some problems must be noticed in the design and manufacture of valve cryogenic test equipment whose orking theory is to dip the valve in the refrigeration fluid and introduces valve cryogenic test briefly.是什么意思_This paper expatiates some problems must be noticed in the design and manufacture of valve cryogenic test equipment whose orking theory is to dip the valve in the refrigeration fluid and introduces valve cryogenic test briefly.在线翻译_英语_读音_用法_例句