The ics 's brian pitt adds that since the holocene epoch -- a part of the quaternary period stretching back roughly 12 000 years -- already recognizes the influence of man no additional designation is needed .
Standard test method for synthetic quaternary ammonium salts in fabric softeners by potentiometric titrations .
用电势滴定法确定织物柔软剂中合成季铵盐的试验方法。
Main compositions : double strands quaternary amine salt , moisturizing grease , plants extract .
主要成份:新型抗菌剂双链季胺盐、润肤脂,植物提取液。
Stripping of gold , silver and copper from loaded quaternary ammonium salt by acidified thiourea solution .
硫脲反萃取季铵盐负载有机相中金、银、铜。
Paleolithic archaeology is closely associated with quaternary research .
第四纪科学与旧石器考古学关系非常密切。
Several polyoxyethylene type quaternary ammonium salt cationic surfactants were selected to investigate their interaction with acid dyes and influence on the dyeing properties .