quaternary system

基本解释

This quaternary system is a simple eutectic type, and no double salt or solid solution was found.
结果表明：该四元体系属简单共饱型，无复盐或固溶体形成；
The reducing in water production of tube well is a familiar problem, especially in the loose bed of the quaternary system.
管井出水量减少是常见的问题，特别是第四系松散层中的管井更为普遍。
Based on solid phosphoric acid catalyst (SPAC) T 49 composed of Si P B ternary system a new SPAC T 99 composed of Si P B D quaternary system was developed.
在硅-磷-硼三元体系的T- 49固体磷酸催化剂基础上，开发了硅-磷-硼- D四元体系的T- 99固体磷酸催化剂。