介绍了一种简便的近距离测定噪声的方法。
The article also introduces a simple noise measuring method at near distance.
降低噪声，一直是提高系统作用距离的主要研制任务。
Noise reducing is all along the main task of. Increasing the active distance of system.
本机特点：风压高、风量大、噪声低，输送距离远等特点。
Characteristics: high wind pressure, large wind amount, low noise, long conveying distance, etc.
本机特点：风压高、风量大、噪声低，输送距离远等特点。
Characteristics: high wind pressure, large wind amount, low noise, long conveying distance, etc.
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