以下为句子列表：
英文: For the manifold of sedan engine, the hest thermal fatigue properties can be obtained by keeping the percent of vermicular graphite at about 50%, therefore it shouldn't he considered that the lowest e.g. percent limit of 50% specified in Chinese Vermicula
中文: 摘要对轿车发动机排气歧管而言，蠕化率控制在50%左右可以获得最佳的抗热疲劳性能，因此不能认为我国的蠕铁标准中规定的蠕化率高于50%的要求偏低了，也不能把蠕化率的高低作为衡量工艺水平的依据。
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英文: The fracture toughness values of vermicular graphite cast iron specimen subjected to four different heat treatment methods were tested and compared.
中文: 摘要比较四种热处理方法下蠕墨铸铁试样的断裂韧度。
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