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1·The resonant characteristics is calculated and analyzed in different backings.

并对不同背衬下的情况进行了计算并分析了谐振特性。

2·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的影响具有明显不同的特性。

3·The lining and the exterior fabric are actually produced as one integral layer, eliminating the need for additional adhesives or backings that can limit airflow.

内里和表层织物完整的连接为一体，不会因为需要使用黏合剂或衬背而限制了空气的流动。

4·Additionally, cabinet backings were pre-finished to prevent off-gassing and the heating, ventilation and air conditioning (HVAC) system was upgraded with improved air filters.

此外，采暖，通风和空调系统的升级与改进也已完毕。

5·The acoustic reflection characteristics of the underwater anechoic coating with cavity are researched in different backings and cavity types, and effects of structure are also analyzed.

本文还研究了带空腔的吸声覆盖层在各种背衬和不同腔型下的声反射特性，分析了结构对其的影响。

(1)backing up回投；封底焊

(1)backing material基底材料

(1)backing off反馈；退绕；铲齿

(1)backing weld用垫环的焊缝；底焊焊缝；打底焊道

(1)backing plate垫板；背板；制动底板

(1)backing out回退；现场恢复