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能的影响具有明显不同的特。

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

壁的外壁分为外层和内层，外层包括覆盖层、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.

蓝星化学术是利用蓝星系列剂通过脱脂、酸除锈、钝化等工艺去除被物体表面的污物或覆盖层。