保持涂料均匀混合，防止颜料在槽中或在被涂物水平面上沉淀。
It keeps the paint uniformly mixed and prevents settling of the pigment in the tank or on horizontal vehicle surfaces.
方法：采用四因素三水平的正交试验法，筛选静脉穿刺涂剂的配方。
Method: The orthogonal test of four factors at three different levels were used.
结论提高医务人员对涂阴肺结核病人诊断水平，减少病人诊断医疗费用支出。
CONCLUSION To improve diagnosis level for smear negative TB patients and decrease the medical expenditure of the patients.
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