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

We adopt high quality alloy steel material and precision work, the product has met the national standards for its reliable quality.

采用优质合金钢材，精工制造，产品质量稳定可靠，超达国家标准。

youdao

The quality of resistance spot welding of low carbon steel and high strength low alloy steel is studied by looking into the dynamic voltage characteristics of the electrodes.

本文通过对电阻点焊电极电压动态特性的分析，研究了低碳钢及低合金高强度钢电阻点焊的质量问题。

youdao