方法：采用沉降法破坏供试液的胶体并去除其不溶性颗粒，以目标菌进行回收率验证试验。
Methods: Usded sedimentation, undermined the colloidal system of sample solution, removal of the insoluble particles, and verified the recovery of the target bacteria.
细微不溶性颗粒高水平持续时间越长，引起心血管疾病的总危险性就越高，包括中风和心脏病发作。
Higher long-term average levels of fine particulate matter also led to a higher overall risk of cardiovascular disease events, including stroke and heart attack.
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