Some units are built to combine the advantages of cross draft with downdraft or updraft gas producers.

有的单位在建造时，结合起来，下吸式或上升气流天然气生产crossdraft的优势。

youdao

Some units are built to combine the advantages of cross draft with downdraft or updraft gas producers.

有的单位在建造时，结合起来，下吸式或上升气流天然气生产crossdraft的优势。

youdao