Filtering protection waste gas exhaustion system.
过载保护功能，废气抽风系统。
The designs of ventilation and smoke exhaustion system for the basement of Gansu Post-net centre are presented.
主要介绍甘肃省管网中心地下室通风与排烟系统的改造设计。
Exhaustion occurs when large amounts of virus, or pieces of the virus (known as antigens), are seen by cells of the immune system over a prolonged period.
当免疫系统的免疫细胞长期接触大量的病毒或病毒片段(也叫做抗原)的时候，就会出现免疫疲劳现象。
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