这里有各种不同的位置和尺寸您可以选择。
There are many different variations of placement and size you could use.
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.
它实用而安全，并且有不同规格和尺寸供您选择。
It is very practical and safe, with different specifications and measurements for your choice.
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