本文介绍了羟乙基纤维素的一般性质, 应用和生产方法.The general properties, application and manufacturing methods of HEC were introduced.研究了高取代度羟乙基纤维素 ( H-HEC ) 的精制工艺.The refining process of high - substitution hydroxyethyl cellulose ( H - HEC ) ...
a course on developing presentational skills展示技巧训练课程Further to your letter, I agree that there are some presentational problems, politically speaking.正如贵方信中所提到的，我也认为从政治角度来说，有一些词语表意上的问题。In a 4 th study, authors investigat...