地板通风率17% - 50%，满足各种级别净化环境要求。

Floor ventilating rate 17%-50%, satisfies each kind of rank purify cation environment request.

youdao

地板通风率17% - 50%，满足各种级别净化环境要求。

Floor ventilating rate 17%-50%, satisfies each kind of rank purify cation environment request.

youdao