分别计算不同尺寸及开启方式的窗结构U值，作为选择最佳投入产出比率的理想依据。
Respectively calculate different sizes and U-value of window's structure of different opening style to be an ideal basis for choosing the best input-output ratio.
分别计算不同尺寸及开启方式的窗结构U值，作为选择最佳投入产出比率的理想依据。
Respectively calculate different sizes and U-value of window's structure of different opening style to be an ideal basis for choosing the best input-output ratio.
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