M: Yes, it's for purchase.<br>A: Yes, is the outside of the association, the whole door and window we just talked about the K value is not only the window frame, must have the glass cooperation to reflect the whole window of a K value performance, how to reduce the K value, we want to constantly improve the configuration of glass, this enterprise will look at his glass configuration and the relationship between his doors and windows window frame, where is its procurement point, this is it.
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