Double-layer transparent films, silicon nitride and silicon dioxide can be used as antireflection coating on silicon PIN photodetector.

氮化硅、二氧化硅双层透明膜可用作硅PIN光电探测器抗反射膜。

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Hydroxyapatite composite coatings were classified into three kinds according to their feature, i. e. single layer composite coating, double layer composite coating and gradient composite coating.

将羟基磷灰石复合涂层按照特征分为三类，即单层复合涂层、双层复合涂层和梯度复合涂层。

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Hydroxyapatite composite coatings were classified into three kinds according to their feature, i. e. single layer composite coating, double layer composite coating and gradient composite coating.

将羟基磷灰石复合涂层按照特征分为三类，即单层复合涂层、双层复合涂层和梯度复合涂层。

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