The new process of domestic pa refining and the technique of high efficiency regular packing tower are introduced.

介绍了国内苯酐精制新工艺和高效规整填料塔技术。

youdao

The new process of domestic pa refining and the technique of high efficiency regular packing tower are introduced.

介绍了国内苯酐精制新工艺和高效规整填料塔技术。

youdao