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。

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The dimensions of these bubbles can be controlled simply by changing the velocity of the airflow across the surface.

这些气泡的结构可以通过改变空气在表面的流速来控制。

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Servo-controlled airflow and pivoting flexible medium pressure line.

中央控制的气流和旋转灵活的中等的压力线。

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Variable airflow and oscillation is controlled either by remote or on the front of the machine.

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