本文阐述了二次空气阀的结构、工作原理和匹配要点。

This article introduces the structure, operating principle and key matching points of secondary air valve.

youdao

本文阐述了二次空气阀的结构、工作原理和匹配要点。

This article introduces the structure, operating principle and key matching points of secondary air valve.

youdao