The optimal parameters of type DJ4 locomotive axle heat treatment are explored by test.

通过系统的实验，探索出了DJ4型机车车轴的最佳热处理工艺参数。

youdao

The optimal parameters of type DJ4 locomotive axle heat treatment are explored by test.

通过系统的实验，探索出了DJ4型机车车轴的最佳热处理工艺参数。

youdao