This paper reviews two dimensional electron gas formed on the liquid helium surface, the semiconductor surface space charge layer and the compound semiconductor heterojunction interface.
本文简要介绍了液氦表面、半导体表面空间电荷层和化合物半导体异质结界面的二维电子气。
The surface layer consists of oxide, sulphide and N, C compound.
表层由氧化物、硫化物和氮（碳）化合物组成；
The unsuitable carbonitriding process, internal oxidation, over deep depth of carbonitrided layer and crust like C N compound on the surface are the main reasons to cause fracture.
碳氮共渗工艺选择不当，共渗层过深，表面出现壳状碳氮化合物、内氧化等缺陷组织是造成其断裂的主要原因。
Intermetallic compound foam reinforced aluminium alloy surface composite layer are obtained by solution treatment after low pressure Casting.
通过低压铸造后固溶处理的方法，获得了网状金属间化合物增强铝合金表面复合层。
The said method can compound alloy layer with high quality and adjustable thickness on the surface of casting with different shape.
本方法可以在不同形状的铸件表面复合合金层，保证了铸件合金层质量，合金层的厚度可以调节，因而有很强的适应性。
The experiment shows that the compound layer with nitride and oxide is obtained in surface of 45 steel by the combined treat of ion nitrocarburizing and oxidizing. The compou…
结果表明，45钢经离子氮碳氧复合渗处理后，表层可获得化合物和氧化物的复合渗层，明显提高45钢的耐磨性能。
Conclusion The compound layer radiation human amnion could be a good biological dress for burn surface.
结论复层辐射人羊膜覆盖烧伤创面是一种理想的生物敷料。
The surface plate consists of foam plastic, an ink layer and a compound flow-casting layer.
所 述表板包括有泡塑、油墨层、复合流延层。
The utility model provides a bamboo wood compound floor. Solid wood or artificial boards are used as base materials. The bamboo wood is used as a surface layer. The two are formed by sticking by glue.
本实用新型提供了一种竹木复合地板，它以实木或人造板为基材，以竹材为面层，二者经胶合粘接构成。
The corrosion protection layer arranged on the surface of the back face aluminium plate enhances the corrosion protection effect of the compound plate, thereby prolonging the service life.
在背面铝板表面设置有防腐层，增强其防腐效果，延长使用寿 命。
The product is based on stainless steel plate with sintering porous bronze layer and rolled PTFE compound 0n the surface. It can be used in strong acid and alkaline.
该产品是以不锈钢为基体，中间烧结多孔青铜层，在表面轧制以PTFE为主的混合物，可在中酸、强酸中使用。
The product is based on stainless steel plate with sintering porous bronze layer and rolled PTFE compound 0n the surface. It can be used in strong acid and alkaline.
该产品是以不锈钢为基体，中间烧结多孔青铜层，在表面轧制以PTFE为主的混合物，可在中酸、强酸中使用。
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