Aclinic tone and assurgent tone take second place.Katabatic tone is always the shortest tone.

一个声调格局中一调最长，平调和升调之，降调最短。

For blower fan coil,adopting local drop ceiling when they are setting with new wind,but adopting a manner of katabatic wind when they arn’t setting with new wind.

对于风，加新风的部分采用局部吊顶，不加新风的部分采用下送风的方式。