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

羟基叉二膦洗后预膜液选择较少有人研究,而适当预膜钝化是洗后金属表面返锈必要措施。

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.

摘要通过系列13羟基对映贝壳杉烯二萜园二色散光谱数据分析，提出一种确定对映贝壳杉烯二萜绝对构型方法。