Based on the principle of relative judgment by law, Proper behavior has the opportunities to become the illegal infringement as the premise of self-defense.
基于违法性判断的相对性原理，正当化行为也可能成立作为正当防卫前提的不法侵害。
Quality is the life of teaching material. The proper evaluation and control is the premise of improving the quality of teaching materials.
教材质量是教材的生命，正确对教材质量进行评估与控制是提高教材质量的前提和基础。
CONCLUSION: On the premise of the proper use of medicine, the dynamic purchase can lower down the high price of pharmaceuticals.
结论动态采购在保证临床合理用药的基础上，可较合理地降低药品的虚高价格。
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