正表面必须由客户界定，必须是总表面上对材料的外观及可用性是至关重要的一部分。

The significant surface must be defined by the customer and is the part of the total surface which is essential to the appearance and serviceability of the item.

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与聚乙烯相比，GAP的总表面的自由能较高，这主要是因为GAP表面含有羟基和叠氮基团。

Compared with polyethylene as a standard sample, GAP has higher surface free energy because there are many hydroxyl groups and azide group in the surface of the GAP molecule.

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住宅总表面积大约85平方米，室内共有8间房，在8.5米高的天花板下包括两间小屋和三层阳台。

In total there are 8 rooms including two huts, three terraces, 8.5 meter ceiling on a total surface of about 85 SQM.

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