Studies on the process conditions of preparing super-clean and high-pure hydrochloric acid by sub-boiling distillation;

Refinement Practice and Control of Impurity in Pure Ca and Ba Series Compound Alloys;

Strangers is created by human being,and the pursuits of purity always want to extinguish them through assimilation strategy and discrimination strategy.

We have learned a lot from the Russian-Soviet literature,but many important distinctive characters such as purity,confessional narration,and religious complex,are neglected,and even reputed by us as negative examples.

This paper is devoted to build an upper bound on the maximum number of clear two-factor interactions in 2~(n-(n-k)) designs with resolution Ⅳ.