Airflow noise in duct should be controlled within the range of standard during duct design.
风道设计中要求风道的气流噪声必须控制在允许的范围内。
The unit generates noise at all frequencies across the human hearing range.
它能产生所有频率的声音，覆盖了整个人类的听力范围。
The cab with adjustable seat features low noise and wide visible range.
噪音低、视野宽阔、可调式的司机座椅。
The cab with adjustable seat features low noise and wide visible range.
噪音低、视野宽阔、可调式的司机座椅。
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