Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution.
用于处理冶金组合物的改进方法，该方法包括使冶金组合物与硝酸水溶液反应。
Conclusion: Pipemidic acid otic solution is highly effective, safe and practical in treating suppurative otitis media.
结论：吡哌酸滴耳剂治疗慢性化脓性中耳炎高效、安全。
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