According to the character of the surfaces of a propagating crack, the balance equations are material rate equations.

根据扩展裂纹表面的特征，平衡方程是实质率型方程。

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According to the character of the surfaces of a propagating crack, the balance equations are material rate equations.

根据扩展裂纹表面的特征，平衡方程是实质率型方程。

youdao