本文就发动机及拖拉机的改装等问题进行了探讨，并对试验结果进行了分析。

Modifications of engine and tractor are discussed and experimental data presented in this paper.

youdao

本文就发动机及拖拉机的改装等问题进行了探讨，并对试验结果进行了分析。

Modifications of engine and tractor are discussed and experimental data presented in this paper.

youdao