There is little study on the selection of liquid of pre - filming after the acid wash by hydroxy ethidine phosphonic acid (HEDP).

羟叉二膦酸酸洗后预膜液的选择较少有人研究,而适当的预膜钝化是防止酸洗后金属表面返锈的必。

Abstract A method is suggested to determine the absolute configuration of ent kaurene diterpenoids by analysing the circular dichroism spectral data of 13 hydroxy ent kaurenoids.

摘通过系列13羟对映贝壳杉烯二萜的园二色散光谱的数据分析，提出一种确定对映贝壳杉烯二萜绝对构型的方法。