在每节的进风口与出风口处都设有调节阀，调节风量的大小。

The air inlet and the air outlet of each section are provided with a regulating valve to adjust the air volume.

youdao

在每节的进风口与出风口处都设有调节阀，调节风量的大小。

The air inlet and the air outlet of each section are provided with a regulating valve to adjust the air volume.

youdao