The drive gears adopt high quality alloy steel, after heat treatment and lapping finish.

传动齿轮采用优质合金钢，经热处理，研磨而成。

youdao

The drive gears adopt high quality alloy steel, after heat treatment and lapping finish.

传动齿轮采用优质合金钢，经热处理，研磨而成。

youdao