同时，系统对用户进行了分级管理，提高了系统的安全性。
Meanwhile, the system grades the users to enhance the system security.
MUC2蛋白的表达在肿瘤的不同T分级组间差异有显著性（P<0.01）。
The expression rate of MUC2 was significantly different among the four T groups(P<0.01).
观察组与对照组大鱼际掌纹形态分级之间有极为显著性差异（P<0.01）。
There is significant difference between the observation group and control group (P< 0.01).
观察组与对照组大鱼际掌纹形态分级之间有极为显著性差异（P<0.01）。
There is significant difference between the observation group and control group (P< 0.01).
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