The process is low in cost and greatly improves the labour conditions.

该工艺无黄烟污染，改善了劳动条件，降低了生产成本，贮运方便。

youdao

The process is low in cost and greatly improves the labour conditions.

该工艺无黄烟污染，改善了劳动条件，降低了生产成本，贮运方便。

youdao