According to the character of the surfaces of a propagating crack, the balance equations are materialrate equations.
根据扩展裂纹表面的特征，平衡方程是实质率型方程。
2
Stand the materialrate of timber species and the investigation of the relationship between factor complex relationship.
林分材种出材率与各调查因子的关系存在复杂关系。
3
Of course, he does not read every piece of material at the same rate, but whether he is reading a newspaper or a chapter in a physics text, his reading rate is relatively fast.