通过对管束大量电子断口的观察分析，证明了断口为准解理断裂，具有河流花样的特征。
According to analysis result of tubes' cracks fracture observation, it proves that the fracture is quasi-cleavage fracture which is characterized by river pattern.
研究表明，“沿晶”、“多边化”和“扇形解理花样”是稀土锆合金断口最常见的微观形貌特征；
The results show that the crack and the hole are the primary microdefect of fracture.
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