Streptococcus Pneumoniae, Neisseria Meningitidis and Haemophilus Influenzae were respectively added to CSF with different leukocytes and protein concentration, and they were centrifuged at different centrifugal force to compare the effect of them on centrifugal force. 将肺炎链球菌,脑膜炎双球菌,流感嗜血杆菌分别加入到蛋白含量不同及白细胞数不同的脑脊液中,在不同离心力下离心,比较脑脊液中蛋白含量及白细胞数量对离心力的影响。