覆盖层

The results show that the influences of various backings on the acoustic characteristics of anechoic coating are obviously different.

结果表明，不同背衬对吸声覆盖层吸声性能影响具有明显不同特性。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉分为层和内层，层包括覆盖层、基棒和基足层等三层，内层只包含一层。

BlueStar cleaning technology uses BlueStar series of cleaning agent eliminate the dirt and cover on the object surface by the technique of degrease, derust and passivation.

学清洗技术是利用系列清洗剂通过脱脂、酸洗除锈、钝等工艺去除被清洗物体表面污物或覆盖层。