According to air horn design theory, JQF low noise air horn device with partial acoustical enclosure has been designed.
按照声号筒设计原理，研究设计了JQ F型低噪声局部隔声罩风笛装置。
According to air horn design theory, JQF low noise air horn device with partial acoustical enclosure has been designed.
按照声号筒设计原理，研究设计了JQ F型低噪声局部隔声罩风笛装置。
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