为防止呼吸机呼气管道中的含菌气体扩散污染病房空气，引发交叉感染。
For avoiding the diffusion of the gas containing bacteria in the tube of the respiration apparatus to pollute the air in ward and make the cross-infection.
本实用新型结构简单，护理方便，病人不需下床能完成大小便，并且不会污染病床。
The utility model is simple in structure, convenient in nursing, and patient finishes urination and defecation without leaving bed, thereby the bed is not polluted.
本文阐述了PCR(基因扩增)技术的原理、基本操作方法，及其在兽医生物制品疫苗污染病毒检测中的应用。
This article expounds the principle of PCR technique, main methods of operations and its application to testing for virus pollution causing by veterinarian biological product.
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