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吸声性能的影响具有明显不同的特性。

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

花粉壁的外壁分为外，外包括覆盖、基棒基足等三，包含一。

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.

蓝星化学清洗技术是利用蓝星系列清洗剂通过脱脂、酸洗除锈、钝化等工艺去除被清洗物体表面的污物或覆盖。