The death cause dominatingly distributed on no cardiac reasons such as pulmonary encephalopathy and respiratory failure, 94.7%(126/133) .
因肺性脑病、呼吸功能衰竭等所导致的死亡居多，占94.7%（126/133）。
2
In addition, tubular membrane is dominatingly made of polyvinylidene fluoride (PVDF) with the integrated production technology and the membrane is tested with self-made leak hunting device.