The requirements are very strict to the thin-wall welding pipe for delivering medical distilled water, injection liquid and other pure medium.

Three no addition method,no addition of flavour and flavouring composition,no addition of sweeteners and no addition of purification agents,is the key point of quality control of Shede and Tuopai liquors.

This paper makes a general review of the basic principle, technical characters, applied fields,technical state and developing tendency of the optical technology of sizing particle impurity in ultrapure mediums.

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.