在国外目前圆形风管的使用率都变得越来越普及,而国内的使用比例只有20%左右。
Now the utilization of circular duct becomes more and more popular abroad, but in China the utilization rate of circular duct is only about 20%.
在国外目前圆形风管的使用率都变得越来越普及,而国内的使用比例只有20%左右。
Now the utilization of circular duct becomes more and more popular abroad, but in China the utilization rate of circular duct is only about 20%.
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