Some in the FDA recommend doing away with the combo products and requiring better designed and standardized dosing devices.
FDA推荐取消套装产品，并要求给药量具标准化和设计得更好。
Pretreatment system generally includes the original pumps, dosing devices, quartz sand filter, activated carbon filter, precision filter and so on.
预处理系统一般包括原水泵、加药装置、石英砂过滤器、活性炭过滤器、精密过滤器等。
应用推荐