建立拉伸试验力学模型，该模型包括“平行长度系统”和“试验机系统”。根据此模型，当考虑试验机系统柔度（刚度的倒数）变形时，导出了横梁位移速率一般性表达式，而当直接考虑试验机系统的附加伸长分量时，导出了形式不同的另一横梁位移速率一般性表达式。分别利用前述的一般性表达式，建立两种横梁位移速率之间的关系，从而分别得到了“斜率补偿”横梁位移速率公式和“K值补偿”横梁位移速率公式。证明了两者补偿横梁位移速率公式互为等效。指出了现行国际标准ISO 6892-1：2019附录F存在的问题和提出了修改建议。

The tensile mechanical model is established, which includes "parallel length system" and "testing machine system". According to this model, when the compliance (reciprocal of stiffness) of the testing machine system is considered, the general expression of the crosshead displacement rate is derived. When the additional elongation component of the testing machine system is directly considered, another general expression of the crosshead displacement rate with different forms is derived. By using the above general expressions, the relationship between the two kinds of crosshead displacement rate is established, and the "slope compensation" crosshead displacement rate formula and the "K value compensation" crosshead displacement rate formula are obtained respectively. It is proved that the two formulas are equivalent to each other. This paper points out the problems existing in Appendix F of current international standard ISO 6892-1:2019 and puts forward some suggestions for revision.