This article introduces the structure, operating principle and key matching points of secondary air valve.
本文阐述了二次空气阀的结构、工作原理和匹配要点。
Union Pacific air yoga complete a secondary education qualification.
完成亚太联盟空中瑜伽一、二级教学资格。
The pollution of secondary ions is the major influence factor for Xiaman air quality.
二次离子污染是影响厦门环境空气质量的主要因子。
The pollution of secondary ions is the major influence factor for Xiaman air quality.
二次离子污染是影响厦门环境空气质量的主要因子。
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