对比曲线a和曲线b可知，曲线a在200摄氏度时出现了明显的尿素分解的吸热峰。
英文：Contrast curves a and curve b show that the curve a at 200 degrees Celsius appeared obvious endothermic peaks of urea decomposition。
The contrast curve A and the curve b show that the absorption peak of the urea decomposition is obvious when the curve A is 200 degrees centigrade.
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